ST72321B STMICROELECTRONICS [STMicroelectronics], ST72321B Datasheet - Page 50

• Manufacturer Part Number: ST72321B
• Description: 64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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, PE7:3,
PE1:0, PF7:3,
Interrupt Ports
PA2:0, PB6:5, PB4, PB2:0, PF1:0 (with pull-up)
Table 12. Port Configuration
*Pull-up always activated on PE2.
50/187
floating input
pull-up input
open drain output
push-pull output
floating input
pull-up interrupt input
open drain output
push-pull output
Port A
Port B
Port C
Port D
Port E
Port F
Port
MODE
MODE
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
Pin name
DDR
DDR
0
0
1
1
0
0
1
1
OR = 0
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
floating
pull-up input only
OR
OR
0
1
0
1
0
1
0
1
floating
Input
floating interrupt
floating interrupt
floating interrupt
pull-up interrupt
pull-up interrupt
pull-up interrupt
True Open Drain Ports
PA7:6
Pull-Up Input Port PE2
floating input
floating interrupt input
open drain output
push-pull output
floating input
open drain (high sink ports)
pull-up input
open drain output*
push-pull output*
OR = 1
pull-up
pull-up
pull-up
pull-up
pull-up
MODE
MODE
open drain*
MODE
open drain
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
DDR
DDR
0
0
1
1
0
1
1
push-pull*
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
OR = 1
DDR
OR
OR
0
1
0
1
0
1
x
0
1