ST72334J4T1(2003) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72334J4T1
(Rev.:2003)

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

STMicroelectronics 

ST72334J/N, ST72314J/N, ST72124J

I/O PORTS (Cont’d)

Table 7. I/O Port Configurations

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

VDD

RPU

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

VDD

RPU

Hardware Configuration

DR REGISTER ACCESS

PULL-UP

CONFIGURATION

DR

W

REGISTER

R

DATA BUS

FROM

OTHER

PINS

INTERRUPT

CONFIGURATION

ALTERNATE INPUT

POLARITY

SELECTION

EXTERNAL INTERRUPT

SOURCE (eix)

ANALOG INPUT

DR REGISTER ACCESS

DR

R/W

REGISTER

DATA BUS

NOT IMPLEMENTED IN

TRUE OPEN DRAIN

I/O PORTS

PAD

VDD

RPU

ALTERNATE

ENABLE

ALTERNATE

OUTPUT

DR REGISTER ACCESS

DR

R/W

REGISTER

DATA BUS

ALTERNATE

ENABLE

ALTERNATE

OUTPUT

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.

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