ST72F521M datasheet(49/199 Pages) STMICROELECTRONICS

Part #	ST72F521M

Description	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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I/O PORTS (Cont’d)

Table 11. I/O Port Configurations

Notes:

1. When the I/O port is in input configuration and the associated alternate function is enabled as an output,

reading the DR register will read the alternate function output status.

2. When the I/O port is in output configuration and the associated alternate function is enabled as an input,

the alternate function reads the pin status given by the DR register content.

Hardware Configuration

CONDITION

PAD

VDD

RPU

EXTERNAL INTERRUPT

DATA BUS

PULL-UP

INTERRUPT

DR REGISTER ACCESS

W

R

SOURCE (eix)

DR

REGISTER

CONDITION

ALTERNATE INPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

ANALOG INPUT

PAD

RPU

DATA BUS

DR

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

REGISTER

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

RPU

DATA BUS

DR

DR REGISTER ACCESS

R/W

VDD

ALTERNATE

ENABLE

OUTPUT

REGISTER

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

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