ST72P314J2T View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72P314J2T

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES

STMicroelectronics 

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ST72334J/N, ST72314J/N, ST72124J

I/O PORTS (Cont’d)

6.1.3 I/O Port Implementation

The I/O port register configurations are summa-

rised as following.

Standard Ports

PA5:4, PC7:0, PD7:0, PE7:4, PE1:0, PF7:6, PF4

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, PB6:4, 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

Switching these I/O ports from one state to anoth-

er should be done in a sequence that prevents un-

wanted side effects. Recommended safe transi-

tions are illustrated in Figure 33 Other transitions

are potentially risky and should be avoided, since

they are likely to present unwanted side-effects

such as spurious interrupt generation.

Figure 33. Interrupt I/O Port State Transition

01

00

INPUT

pull-up/floatin g

interrupt

INPUT

floating

(reset state)

10

OUTPUT

open-drain

11

OUTPUT

push-pull

XX = DDR, OR

True Open Drain Ports

PA7:6

MODE

floating input

open drain (high sink ports)

DDR

0

1

Table 9. Port Configuration

Port

Port A

Port B

Port C

Port D

Port E

Port F

Pin name

PA7:6

PA5:4

PA3

PA2:0

PB7, PB3

PB6:4, PB2:0

PC7:0

PD7:0

PE7:4, PE1:0

PF7:6, PF4

PF2

PF1:0

OR = 0

floating

floating

floating

floating

floating

floating

floating

floating

floating

floating

floating

Input

OR = 1

floating

pull-up

floating interrupt

pull-up interrupt

floating interrupt

pull-up interrupt

pull-up

pull-up

pull-up

pull-up

floating interrupt

pull-up 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

open drain

push-pull

open drain

push-pull

open drain

push-pull

open drain

push-pull

open drain

push-pull

open drain

push-pull

open drain

push-pull

44/125

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