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ST72521

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I/O PORTS (Cont’d)

9.5.1 I/O Port Implementation

The I/O port register configurations are summa-

rised as follows.

Standard Ports

PA5:4, PC7:0, PD7:0, PE7:34,

PE1:0, PF7:3, PG7:0, PH7:0

Interrupt Ports

PA2:0, PB6:5, PB4, PB2:0, PF1:0 (with pull-up)

PA3, PB7, PB3, PF2 (without pull-up)

True Open Drain Ports

PA7:6

Pull-up Input Port (CANTX requirement)

PE2

Table 11. Port Configuration

* Note: when the CANTX alternate function is selected the I/O port operates in output push-pull mode.

MODE

DDR

floating input

pull-up input

open drain output

push-pull output

MODE

DDR

floating input

pull-up interrupt input

open drain output

push-pull output

MODE

DDR

floating input

floating interrupt input

open drain output

push-pull output

MODE

DDR

floating input

open drain (high sink ports)

MODE

pull-up input

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

PA2:0

floating

pull-up interrupt

open drain

push-pull

Port B

PB7, PB3

floating

floating interrupt

open drain

push-pull

PB6:5, PB4,

PB2:0

floating

pull-up interrupt

open drain

push-pull

Port C

PC7:0

floating

pull-up

open drain

push-pull

Port D

PD7:0

floating

pull-up

open drain

push-pull

Port E

PE7:3, PE1:0

floating

pull-up

open drain

push-pull

PE2

pull-up input only *

Port F

PF7:3

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

Port G

PG7:0

floating

pull-up

open drain

push-pull

Port H

PH7:0

floating

pull-up

open drain

push-pull

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