.hide-partial { max-height: none; } .show-more { display: none; }

STMicroelectronics Embedded Processors & Controllers

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Types of Embedded Processors & Controllers

List Images

Results: 5,721

Applied Filters:

Manufacturer = STMicroelectronics

Product Type

Mounting Style

Package / Case

Core

Data Bus Width

Maximum Clock Frequency

Program Memory Size

L1 Cache Instruction Memory

L1 Cache Data Memory

Data RAM Size

ADC Resolution

Number of I/Os

Minimum Operating Temperature

Maximum Operating Temperature

Qualification

Packaging

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Part #

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32 Kbytes of Flash , 32 MHz

STM32L051R6H6
STMicroelectronics
1: $5.17
3,455In Stock

Mfr. Part #
STM32L051R6H6

Mouser Part #
511-STM32L051R6H6

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32 Kbytes of Flash , 32 MHz

Learn More

Datasheet

3,455In Stock

$5.17

$3.48

$3.27

$2.81

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

ARM Cortex M0+

32 bit

32 MHz

32 kB

8 kB

12 bit

51 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Ultra-low-power ARM Cortex-M0+ MCU 192-Kbytes Flash, 32 MHz CPU, AES

STM32L082CZY3TR
STMicroelectronics
1: $9.24
3,366In Stock

Mfr. Part #
STM32L082CZY3TR

Mouser Part #
511-STM32L082CZY3TR

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power ARM Cortex-M0+ MCU 192-Kbytes Flash, 32 MHz CPU, AES

Learn More

Datasheet

3,366In Stock

Cut Tape

$9.24

$7.07

$6.21

$5.93

View

Reel

$4.67

Min.: 1
Mult.: 1

: 5,000

ARM Microcontrollers - MCU

SMD/SMT

WLCSP-49

ARM Cortex M0+

32 bit

32 MHz

192 kB

20 kB

12 bit

40 I/O

- 40 C

+ 125 C

Reel, Cut Tape

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash 32 MHz CPU, USB, LCD, AES

STM32L083VBT6
STMicroelectronics
1: $9.30
364In Stock

Mfr. Part #
STM32L083VBT6

Mouser Part #
511-STM32L083VBT6

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash 32 MHz CPU, USB, LCD, AES

Learn More

Datasheet

364In Stock

$9.30

$6.60

$6.06

$5.72

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

LQFP-100

Tray

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 32 Kbytes of Flash , 32 MHz CPU, USB

STM32L151C6U6A
STMicroelectronics
1: $8.83
1,498In Stock

Mfr. Part #
STM32L151C6U6A

Mouser Part #
511-STM32L151C6U6A

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 32 Kbytes of Flash , 32 MHz CPU, USB

Learn More

Datasheet

1,498In Stock

$8.83

$6.35

$5.75

$5.26

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

UFQPFN-48

ARM Cortex M3

32 bit

32 MHz

32 kB

10 kB

12 bit

37 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 128 Kbytes of Flash , USB

STM32L422TBY6TR
STMicroelectronics
1: $6.26
3,187In Stock

Mfr. Part #
STM32L422TBY6TR

Mouser Part #
511-STM32L422TBY6TR

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 128 Kbytes of Flash , USB

Datasheet

3,187In Stock

Cut Tape

$6.26

$4.74

$4.12

$3.93

$3.60

Reel

$3.60

Min.: 1
Mult.: 1
Max.: 750

: 5,000

ARM Microcontrollers - MCU

SMD/SMT

WLCSP-36

ARM Cortex M4

32 bit

80 MHz

128 kB

40 kB

2 x 12 bit

30 I/O

- 40 C

+ 85 C

Reel, Cut Tape

ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M33 Trust Zone, MCU 110 MHz 512 kbytes of Flash

STM32L562CEU6P
STMicroelectronics
1: $17.90
795In Stock

Mfr. Part #
STM32L562CEU6P

Mouser Part #
511-STM32L562CEU6P

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M33 Trust Zone, MCU 110 MHz 512 kbytes of Flash

Learn More

Datasheet

795In Stock

$17.90

$13.91

$13.28

$11.52

$11.00

Min.: 1
Mult.: 1
Max.: 250

ARM Microcontrollers - MCU

SMD/SMT

UFQFPN-48

ARM Cortex M33

32 bit

110 MHz

512 kB

256 kB

2 x 12 bit

36 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Ultra-low-power dual core MCU 64 MHz Cortex-M0+ 32MHz 256 Kbyte Bluetooth LE 5.0

STM32WB55VEQ6
STMicroelectronics
1: $10.63
463In Stock

Mfr. Part #
STM32WB55VEQ6

Mouser Part #
511-STM32WB55VEQ6

STMicroelectronics

ARM Microcontrollers - MCU Ultra-low-power dual core MCU 64 MHz Cortex-M0+ 32MHz 256 Kbyte Bluetooth LE 5.0

Learn More

Datasheet

463In Stock

$10.63

$8.97

$8.63

$7.89

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

UFBGA-129

Tray

8-bit Microcontrollers - MCU 8-bit Ultra-Low PWR 16kB ProxSense SPI

STM8TL52G4U6
STMicroelectronics
1: $5.89
2,816In Stock
NRND

Mfr. Part #
STM8TL52G4U6

Mouser Part #
511-STM8TL52G4U6

NRND

STMicroelectronics

8-bit Microcontrollers - MCU 8-bit Ultra-Low PWR 16kB ProxSense SPI

Datasheet

2,816In Stock

$5.89

$4.45

$3.86

$3.67

View

Min.: 1
Mult.: 1

8-bit Microcontrollers - MCU

SMD/SMT

STM8

8 bit

16 MHz

16 kB

4 kB

No ADC

17 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU 32B ARM Cortex-M4 1Mb Flash 168MHz CPU

STM32F405ZGT6W
STMicroelectronics
1: $25.83
714In Stock
NRND

Mfr. Part #
STM32F405ZGT6W

Mouser Part #
511-STM32F405ZGT6W

NRND

STMicroelectronics

ARM Microcontrollers - MCU 32B ARM Cortex-M4 1Mb Flash 168MHz CPU

Learn More

Datasheet

714In Stock

$25.83

$20.71

$18.81

$17.64

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

LQFP-144

ARM Cortex M4

32 bit

168 MHz

1 MB

192 kB

12 bit

114 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU 32-Bit ARM Cortex 32kb Low Power MCU

STM32L151C6T6
STMicroelectronics
1: $9.72
311In Stock
NRND

Mfr. Part #
STM32L151C6T6

Mouser Part #
511-STM32L151C6T6

NRND

STMicroelectronics

ARM Microcontrollers - MCU 32-Bit ARM Cortex 32kb Low Power MCU

Learn More

Datasheet

311In Stock

$9.72

$7.46

$6.55

$6.26

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

ARM Cortex M3

32 bit

32 MHz

32 kB

10 kB

12 bit

37 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU STM32L15 Low Power M3 256kB 32MHz MCU

STM32L151RCT6A
STMicroelectronics
1: $14.90
395In Stock
NRND

Mfr. Part #
STM32L151RCT6A

Mouser Part #
511-STM32L151RCT6A

NRND

STMicroelectronics

ARM Microcontrollers - MCU STM32L15 Low Power M3 256kB 32MHz MCU

Learn More

Datasheet

395In Stock

$14.90

$11.55

$10.63

$9.56

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

LQFP-64

ARM Cortex M3

32 bit

32 MHz

256 kB

32 kB

12 bit

51 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M4 170 MHz 512 Kbytes Flash Math Accel High Analog level

STM32G491VET6TR
STMicroelectronics
1: $15.02
14In Stock
1,000On Order

Mfr. Part #
STM32G491VET6TR

Mouser Part #
511-STM32G491VET6TR

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M4 170 MHz 512 Kbytes Flash Math Accel High Analog level

Datasheet

14In Stock

1,000On Order

Cut Tape

$15.02

$11.61

$11.07

$9.60

Reel

$9.60

MouseReel Available

Min.: 1
Mult.: 1
Max.: 150

: 1,000

ARM Microcontrollers - MCU

SMD/SMT

LQFP-100

ARM Cortex M4

32 bit

170 MHz

112 kB

12 bit

86 I/O

- 40 C

+ 85 C

Reel, Cut Tape, MouseReel

ARM Microcontrollers - MCU High-performance Arm Cortex-M33 MCU 256-Kbyte Flash 272-Kbyte RAM 250 MHz CPU

STM32H523CCU7
STMicroelectronics
1: $8.27
58In Stock
1,560Expected 2027-01-20
New Product

Mfr. Part #
STM32H523CCU7

Mouser Part #
511-STM32H523CCU7

New Product

STMicroelectronics

ARM Microcontrollers - MCU High-performance Arm Cortex-M33 MCU 256-Kbyte Flash 272-Kbyte RAM 250 MHz CPU

Learn More

Datasheet

58In Stock

1,560Expected 2027-01-20

$8.27

$5.77

$5.39

$4.56

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

Tray

ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 2 Mbytes of Flash

STM32F479BIT6
STMicroelectronics
1: $29.15
59In Stock
720Expected 2026-11-09

Mfr. Part #
STM32F479BIT6

Mouser Part #
511-STM32F479BIT6

STMicroelectronics

ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 2 Mbytes of Flash

Learn More

Datasheet

59In Stock

720Expected 2026-11-09

$29.15

$23.56

$21.23

$20.46

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

SMD/SMT

LQFP-208

ARM Cortex M4

32 bit

180 MHz

2 MB

384 kB

3 x 12 bit

161 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C

STM32C551KEU6
STMicroelectronics
1: $3.67
2,780In Stock
New Product

Mfr. Part #
STM32C551KEU6

Mouser Part #
511-STM32C551KEU6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C

Learn More

Datasheet

2,780In Stock

$3.67

$2.72

$2.35

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

UFQFPN-32

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

25 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

STM32C552CET6
STMicroelectronics
1: $3.93
1,557In Stock
New Product

Mfr. Part #
STM32C552CET6

Mouser Part #
511-STM32C552CET6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

Learn More

Datasheet

1,557In Stock

$3.93

$2.92

$2.52

$2.39

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

LQFP-48

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

38 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

STM32C552CEU6
STMicroelectronics
1: $3.93
1,534In Stock
New Product

Mfr. Part #
STM32C552CEU6

Mouser Part #
511-STM32C552CEU6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

Learn More

Datasheet

1,534In Stock

$3.93

$2.92

$2.52

$2.39

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

UFQFPN-48

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

38 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

STM32C552KET6
STMicroelectronics
1: $3.80
1,551In Stock
New Product

Mfr. Part #
STM32C552KET6

Mouser Part #
511-STM32C552KET6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN

Learn More

Datasheet

1,551In Stock

$3.80

$2.82

$2.43

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

LQFP-32

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

25 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

STM32C562CET6
STMicroelectronics
1: $4.25
1,476In Stock
New Product

Mfr. Part #
STM32C562CET6

Mouser Part #
511-STM32C562CET6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

Learn More

Datasheet

1,476In Stock

$4.25

$3.17

$2.74

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

LQFP-48

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

38 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

STM32C562CEU6
STMicroelectronics
1: $3.70
1,247In Stock
New Product

Mfr. Part #
STM32C562CEU6

Mouser Part #
511-STM32C562CEU6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

Learn More

Datasheet

1,247In Stock

$3.70

$2.75

$2.51

$2.25

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

UFQFPN-48

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

38 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

STM32C562KET6
STMicroelectronics
1: $4.12
1,576In Stock
New Product

Mfr. Part #
STM32C562KET6

Mouser Part #
511-STM32C562KET6

New Product

STMicroelectronics

ARM Microcontrollers - MCU Mainstream Arm Cortex-M33 MCU, 144 MHz, 512 KB flash, 128 KB RAM, I3C, FDCAN, crypto

Learn More

Datasheet

1,576In Stock

$4.12

$3.07

$2.65

$2.52

Min.: 1
Mult.: 1
Max.: 100

ARM Microcontrollers - MCU

SMD/SMT

LQFP-32

ARM Cortex M33

32 bit

144 MHz

512 kB

128 kB

12 bit

25 I/O

- 40 C

+ 85 C

Tray

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

STM32H5E4IJT6
STMicroelectronics
1: $21.02
300In Stock
New Product

Mfr. Part #
STM32H5E4IJT6

Mouser Part #
511-STM32H5E4IJT6

New Product

STMicroelectronics

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

Learn More

Datasheet

300In Stock

$21.02

$15.97

$15.31

Min.: 1
Mult.: 1
Max.: 50

ARM Microcontrollers - MCU

Tray

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

STM32H5E4ZJT6
STMicroelectronics
1: $18.91
272In Stock
New Product

Mfr. Part #
STM32H5E4ZJT6

Mouser Part #
511-STM32H5E4ZJT6

New Product

STMicroelectronics

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

Learn More

Datasheet

272In Stock

$18.91

$14.57

$13.06

$12.33

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

Tray

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

STM32H5F4ZJT6
STMicroelectronics
1: $19.97
292In Stock
New Product

Mfr. Part #
STM32H5F4ZJT6

Mouser Part #
511-STM32H5F4ZJT6

New Product

STMicroelectronics

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

Learn More

Datasheet

292In Stock

$19.97

$15.42

$13.81

Min.: 1
Mult.: 1
Max.: 50

ARM Microcontrollers - MCU

Tray

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

STM32H5F5ZJT6
STMicroelectronics
1: $20.32
283In Stock
New Product

Mfr. Part #
STM32H5F5ZJT6

Mouser Part #
511-STM32H5F5ZJT6

New Product

STMicroelectronics

ARM Microcontrollers - MCU High-performance, Arm Cortex-M33 with TrustZone, MCU with 4-Mbyte Flash, 1504-Kbyte RAM, 250 MHz CPU

Learn More

Datasheet

283In Stock

$20.32

$15.71

$14.07

$13.82

View

Min.: 1
Mult.: 1

ARM Microcontrollers - MCU

Tray

STMicroelectronics Embedded Processors & Controllers

Types of Embedded Processors & Controllers

Mouser®

Company

Resources

Support

BGA-100
BGA-132
BGA-144
BGA-168
BGA-169
BGA-176
BGA-216
BGA-292
BGA-64
BGA-73
CSP-100
CSP-115
CSP-36
CSP-48
CSP-64
CSP-72
CSP-81
FPBGA-292
FPBGA-302
FPBGA-386

ARM1176JZ-F
ARM Cortex-A35
ARM Cortex A35, ARM Cortex M33
ARM Cortex A7
ARM Cortex A7, ARM Cortex M4
ARM Cortex M0
ARM Cortex-M0, ARM Cortex-M4
ARM Cortex M0+
ARM Cortex M0+, ARM Cortex M4
ARM Cortex M3
ARM Cortex M33
ARM Cortex M33, ARM Cortex A35
ARM Cortex M35P
ARM Cortex M4
ARM Cortex M4, ARM Cortex M7
ARM Cortex M4F
ARM Cortex M55
ARM Cortex M7
ARM Cortex-R52+
e200z0

8 MHz
15 MHz
16 MHz
16 MHz/32 MHz
20 MHz
24 MHz
32 MHz
32 MHz, 64 MHz
36 MHz
48 MHz
56 MHz
64 MHz
72 MHz
80 MHz
80 MHz, 120 MHz
80 MHz, 160 MHz
84 MHz
96 MHz
100 MHz
110 MHz

0 B
1 KB
2 kB
4 kB
8 kB
16 kB
32 kB
64 kB
96 kB
128 KB
128 kB
160 kB
176 kB
192 kB
256 kB
320 kB
384 kB
512 kB
640 kB
768 kB

384 B
512 B
1 kB
1.5 kB
2 kB
4 kB
6 kB
8 kB
10 kB
12 kB
16 KB
16 kB
18 kB
20 kB
22 kB
24 kB
32 KB
32 kB
36 kB
40 kB

2 x 10 bit
2 x 10 bit, 5 x 12 bit, 6 x 16 bit
2 x 12 bit
2 x 16 bit
2 x 6 bit/8 bit/10 bit/12 bit
2 x 8 bit/10 bit/12 bit
3 x 10 bit, 5 x 12 bit, 6 x 16 bit
3 x 12 bit
3 x 12 bit, 1 x 16 bit
3 x 16 bit
4 x 12 bit
4 x 6 bit/8 bit/10 bit/12 bit
5 x 12 bit
5 x 12 bit, 2 x 16 bit
6 bit/8 bit/10 bit/12 bit
8 bit to 16 bit
10 bit
10 bit, 12 bit
10 bit, 3 x 12 bit
10 bit, 4 x 12 bit

5 I/O
6 I/O
8 I/O
9 I/O
10 I/O
11 I/O
14 I/O
15 I/O
16 I/O
17 I/O
18 I/O
19 I/O
20 I/O
21 I/O
22 I/O
23 I/O
24 I/O
25 I/O
26 I/O
27 I/O