ST72521AR9TC 查看數據表（PDF） - STMicroelectronics
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ST72521AR9TC
STMicroelectronics
ST72521AR9TC Datasheet PDF : 211 Pages
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ST72521
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
MODE
floating input
pull-up input
open drain output
push-pull output
DDR OR
0
0
0
1
1
0
1
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 OR
0
0
0
1
1
0
1
1
PA3, PB7, PB3, PF2 (without pull-up)
MODE
floating input
floating interrupt input
open drain output
push-pull output
DDR OR
0
0
0
1
1
0
1
1
True Open Drain Ports
PA7:6
MODE
floating input
open drain (high sink ports)
DDR
0
1
Pull-up Input Port (CANTX requirement)
PE2
MODE
pull-up input
Table 11. Port Configuration
Port
Port A
Port B
Port C
Port D
Port E
Port F
Port G
Port H
Pin name
PA7:6
PA5:4
PA3
PA2:0
PB7, PB3
PB6:5, PB4,
PB2:0
PC7:0
PD7:0
PE7:3, PE1:0
PE2
PF7:3
PF2
PF1:0
PG7:0
PH7:0
OR = 0
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
Input
OR = 1
floating
pull-up
floating interrupt
pull-up interrupt
floating interrupt
Output
OR = 0
OR = 1
true open-drain
open drain
push-pull
open drain
push-pull
open drain
push-pull
open drain
push-pull
pull-up interrupt
open drain
push-pull
pull-up
open drain
pull-up
open drain
pull-up
open drain
pull-up input only *
pull-up
open drain
floating interrupt
open drain
pull-up interrupt
open drain
pull-up
open drain
pull-up
open drain
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
* Note: when the CANTX alternate function is selected the I/O port operates in output push-pull mode.
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