ST72561K9-Auto datasheet(79/324 Pages) STMICROELECTRONICS

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ST72561-Auto

I/O ports

Doc ID 12370 Rev 8

79/324

8.4.3

Pull-up input port (CANTX requirement)

The PC4 port cannot operate as a general purpose output. The CAN peripheral controls it

directly when enabled. Otherwise, PC4 is a pull-up input.

If DDR = 1 it is still possible to read the port through the DR register.

Table 31.

Configuration of PC4

Mode

pull-up input

Table 32.

Port configuration

Port

Pin name

Input

Output

OR = 0

OR = 1

OR = 0

OR = 1

Port A

PA0

floating

pull-up interrupt (ei0)

open drain

push-pull

PA1

floating interrupt (ei0)

PA2

pull-up interrupt (ei0)

PA3

floating interrupt (ei0)

PA4

pull-up interrupt (ei0)

PA5

floating interrupt (ei0)

PA6

pull-up interrupt (ei0)

PA7

floating interrupt (ei0)

Port B

PB0

floating

pull-up interrupt (ei1)

open drain

push-pull

PB1

floating interrupt (ei1)

PB2

pull-up interrupt (ei1)

PB3

floating interrupt (ei1)

PB4

pull-up interrupt (ei1)

PB5

floating interrupt (ei1)

Port C

PC0

floating

pull-up

open drain

push-pull

PC1

pull-up interrupt (ei2)

PC2

floating interrupt (ei2)

PC3

pull-up

PC4

pull-up

controlled by CANTX(1)

PC7:5

floating

pull-up

open drain

push-pull

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