ST72104G datasheet(32/135 Pages) STMICROELECTRONICS

No de pièce	ST72104G

Description	8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES

PDF	135 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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32 / 135 page

ST72104G, ST72215G, ST72216G, ST72254G

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I/O PORTS (Cont’d)

Table 7. 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 Configu ration

CONDITION

PAD

VDD

RPU

EXTERNAL INTERRU PT

POLARITY

DATA BUS

PULL-UP

INTERRUPT

DR REGISTER ACCESS

FROM

OTHER

PINS

SOURCE (eix)

SELECTI ON

CONDITIO N

ALTERNATE INPUT

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

ANALOG INPUT

PAD

RPU

DATA BUS

DR REGIST ER ACCESS

R/W

VDD

ALTERNATE

ENAB LE

OUTPUT

REGIST ER

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

RPU

DATA BUS

DR REGIST ER ACCESS

R/W

VDD

ALTERNATE

ENAB LE

OUTPUT

REGIST ER

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

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