ST72344S4 datasheet(80/247 Pages) STMICROELECTRONICS

80 / 247 page

I/O ports

ST72344xx, ST2345xx

80/247

Doc ID 12321 Rev 6

Caution:

In small packages, an internal pull-up is applied permanently to the non-bonded I/O pins. So

they have to be kept in input floating configuration to avoid unwanted consumption.

Table 35.

Port configuration

Port

Pin name

Input

Output

OR = 0

OR = 1

OR = 0

OR = 1

Port A

PA7:6

floating

true open-drain

PA5:4

floating

pull-up

open drain

push-pull

PA3

floating

floating interrupt

open drain

push-pull

Port B

PB3

floating

floating interrupt

open drain

push-pull

PB4,

PB2:0

floating

pull-up interrupt

open drain

push-pull

Port C

PC7:0

floating

pull-up

open drain

push-pull

Port D

PD7:6

floating

true open-drain

PD5:0

floating

pull-up

open drain

push-pull

Port E

PE1

floating

floating interrupt

open drain

push-pull

PE0

floating

pull-up

open drain

push-pull

Port F

PF7:6, 4

floating

pull-up

open drain

push-pull

PF2

floating

floating interrupt

open drain

push-pull

PF1:0

floating

pull-up interrupt

open drain

push-pull

Table 36.

I/O port register map and reset values

Address

(Hex.)

label

654

321

Reset value

of all I/O port registers

000

0000h

PADR

MSB

LSB

0001h

PADDR

0002h

PAOR

0003h

PBDR

MSB

LSB

0004h

PBDDR

0005h

PBOR

0006h

PCDR

MSB

LSB

0007h

PCDDR

0008h

PCOR

0009h

PDDR

MSB

LSB

000Ah

PDDDR

000Bh

PDOR

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