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ST72104G2 Datasheet(PDF) 32 Page - STMicroelectronics

Part # ST72104G2
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES
Download  135 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72104G2 Datasheet(HTML) 32 Page - STMicroelectronics

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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
W
R
FROM
OTHER
PINS
SOURCE (eix)
SELECTI ON
DR
REGISTER
CONDITIO N
ALTERNATE INPUT
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
ANALOG INPUT
PAD
RPU
DATA BUS
DR
DR REGIST ER ACCESS
R/W
VDD
ALTERNATE
ALTERNATE
ENAB LE
OUTPUT
REGIST ER
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
PAD
RPU
DATA BUS
DR
DR REGIST ER ACCESS
R/W
VDD
ALTERNATE
ALTERNATE
ENAB LE
OUTPUT
REGIST ER
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS


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