ST72T311 ST Microelectronics, ST72T311 Datasheet - Page 29

• Manufacturer Part Number: ST72T311
• Description: 8-BIT MCU WITH 8 TO 16K OTP/EPROM
• Manufacturer: ST Microelectronics

I/O PORTS (Cont’d)
Table 11. Port Configuration
Notes:
1. ST72T311N only
2. For OTP/EPROM version, when OR=0: floating & when OR=1: reserved
3. For OTP/EPROM version, when OR=0: open-drain, high sink capability & when OR=1: reserved
* 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 val-
ue. They must not be modified by the user otherwise a spurious interrupt may be generated.
Port A
Port C
Port D
Port F
Port B
Port E
Port
PF4, PF6, PF7
PA0:PA2
PB5:PB7
PD6:PD7
PE4:PE7
Pin name
PA4:PA7
PB0:PB4
PC0:PC7
PD0:PD5
PE0:PE1
PF0:PF2
PA3
1)
1)
1)
1)
floating*
floating*
floating*
floating*
floating*
floating*
floating*
floating*
floating*
floating*
OR = 0
Input (DDR = 0)
floating*
floating*
pull-up with interrupt
pull-up with interrupt
pull-up with interrupt
pull-up with interrupt
pull-up with interrupt
2)
OR = 1
pull-up
pull-up
pull-up
pull-up
pull-up
true open drain, high sink capability
open-drain
open-drain
open-drain
open-drain
open-drain
open-drain
open-drain
open-drain
open-drain
open-drain
OR = 0
high sink capability
ST72E311 ST72T311
Output (DDR = 1)
true open drain,
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
OR =1
3)
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