ST72F321J ST Microelectronics, ST72F321J Datasheet - Page 48

• Manufacturer Part Number: ST72F321J
• Description: 8-BIT MCU
• Manufacturer: ST Microelectronics

www.DataSheet4U.com
DataSheet
ST72321J
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, PD5:0,
PE1:0, PF7:6, 4
Interrupt Ports
PB4, PB2:0, PF1:0 (with pull-up)
Table 12. Port Configuration
48/179
floating input
pull-up input
open drain output
push-pull output
floating input
pull-up interrupt input
open drain output
push-pull output
4
Port C
Port D
U
Port A
Port B
Port E
Port F
Port
.com
MODE
MODE
PA7:6
PA5:4
PA3
PB3
PB4, PB2:0
PC7:0
PD5:0
PE1:0
PF7:6, 4
PF2
PF1:0
Pin name
DDR
DDR
0
0
1
1
0
0
1
1
OR = 0
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
www.DataSheet4U.com
OR
OR
0
1
0
1
0
1
0
1
floating
Input
floating interrupt
floating interrupt
floating interrupt
pull-up interrupt
pull-up interrupt
PA3, PB3, PF2 (without pull-up)
True Open Drain Ports
PA7:6
floating input
floating interrupt input
open drain output
push-pull output
floating input
open drain (high sink ports)
OR = 1
pull-up
pull-up
pull-up
pull-up
pull-up
MODE
MODE
open drain
open drain
open drain
open drain
open drain
open drain
open drain
open drain
open drain
open drain
OR = 0
true open-drain
Output
www.DataSheet
www.DataSheet
www.DataSheet
www.DataSheet4U
DDR
0
0
1
1
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
OR = 1
DDR
OR
0
1
0
1
0
1
4U
4U.com
4U
.com
.com
.com