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ST72321AR6 Datasheet

  • ST72321AR6

  • 8-BIT MCU WITH NESTED INTERRUPTS, FLASH,10-BIT ADC, FIVE TIM...

  • STMicroelectronics   STMicroelectronics

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ST72321
I/O PORTS
(Cont鈥檇)
Table 10. I/O Port Configurations
Hardware Configuration
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
V
DD
R
PU
PAD
PULL-UP
CONDITION
DR REGISTER ACCESS
DR
REGISTER
W
DATA BUS
R
INPUT
1)
ALTERNATE INPUT
EXTERNAL INTERRUPT
SOURCE (ei
x
)
INTERRUPT
CONDITION
ANALOG INPUT
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
OPEN-DRAIN OUTPUT
2)
V
DD
R
PU
DR REGISTER ACCESS
PAD
DR
REGISTER
R/W
DATA BUS
ALTERNATE
ENABLE
ALTERNATE
OUTPUT
PUSH-PULL OUTPUT
2)
NOT IMPLEMENTED IN
TRUE OPEN DRAIN
I/O PORTS
V
DD
R
PU
DR REGISTER ACCESS
PAD
DR
REGISTER
R/W
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.
48/185

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