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ST72324 View Datasheet(PDF) - STMicroelectronics

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ST72324 Datasheet PDF : 163 Pages
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ST72324
I/O PORTS (Cont’d)
Table 11. I/O Port Configurations
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
PAD
VDD
RPU
Hardware Configuration
DR REGISTER ACCESS
PULL-UP
CONDITION
DR
W
REGISTER
R
DATA BUS
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
PAD
VDD
RPU
INTERRUPT
CONDITION
ALTERNATE INPUT
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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