ST72E121 datasheet(27/92 Pages) STMICROELECTRONICS

No de pièce	ST72E121

Description	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

PDF	92 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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27 / 92 page

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ST72E121 ST72T121

I/O PORTS (Cont’d)

Table 10. Port Configuration

* Reset state (The bits corresponding to unavailable pins are forced to 1 by hardware, this affects the reset status value).

Warning: All bits of the DDR register which correspond to unconnected I/Os must be left at their reset value. They must

not be modified by the user otherwise a spurious interrupt may be generated.

Port

Pin name

Input (DDR = 0)

Output (DDR = 1)

OR = 0

OR = 1

OR = 0

OR =1

Port A

PA3

floating*

pull-up with interrupt

open-drain

push-pull

PA4:PA7

floating*

true open drain, high sink capability

Port B

PB0:PB4

floating*

pull-up with interrupt

open-drain

push-pull

Port C

PC0:PC7

floating*

pull-up

open-drain

push-pull

Port D

PD0:PD5

floating*

pull-up

open-drain

push-pull

Port E

PE0:PE1

floating*

pull-up

open-drain

push-pull

Port F

PF0:PF2

floating*

pull-up with interrupt

open-drain

push-pull

PF4, PF6, PF7

floating*

pull-up

open-drain

push-pull

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