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ST72321AR6 Datasheet

  • ST72321AR6

  • 8-BIT MCU WITH NESTED INTERRUPTS, FLASH,10-BIT ADC, FIVE TIM...

  • STMicroelectronics   STMicroelectronics

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ST72321
I/O PORTS
(Cont鈥檇)
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,
MODE
floating input
pull-up input
open drain output
push-pull output
DDR
0
0
1
1
OR
0
1
0
1
PA3, PB7, PB3, PF2
(without pull-up)
MODE
floating input
floating interrupt input
open drain output
push-pull output
DDR
0
0
1
1
OR
0
1
0
1
True Open Drain Ports
PA7:6
MODE
floating input
open drain (high sink ports)
DDR
0
1
Interrupt Ports
PA2:0, PB6:5, PB4, PB2:0, PF1:0
(with pull-up)
MODE
floating input
pull-up interrupt input
open drain output
push-pull output
DDR
0
0
1
1
OR
0
1
0
1
Pull-up Input Port
PE2
MODE
pull-up input
Table 11. Port Configuration
Port
Pin name
PA7:6
PA5:4
PA3
PA2:0
PB7, PB3
Port B
Port C
Port D
Port E
PB6:5, PB4,
PB2:0
PC7:0
PD7:0
PE7:3, PE1:0
PE2
PF7:3
PF2
PF1:0
Input
OR = 0
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
pull-up
floating interrupt
pull-up interrupt
floating interrupt
pull-up interrupt
pull-up
pull-up
pull-up
Output
OR = 1
OR = 0
OR = 1
true open-drain
open drain
push-pull
open drain
push-pull
open drain
open drain
open drain
open drain
open drain
open drain
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
Port A
pull-up input only
pull-up
open drain
floating interrupt
pull-up interrupt
open drain
open drain
Port F
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