st72324bk STMicroelectronics, st72324bk Datasheet - Page 52

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

I/O ports
Caution:
52/167
Table 18.
1. When the I/O port is in input configuration and the associated alternate function is enabled as an output,
2. When the I/O port is in output configuration and the associated alternate function is enabled as an input,
The alternate function must not be activated as long as the pin is configured as input with
interrupt, in order to avoid generating spurious interrupts.
Analog alternate function
When the pin is used as an ADC input, the I/O must be configured as floating input. The
analog multiplexer (controlled by the ADC registers) switches the analog voltage present on
the selected pin to the common analog rail which is connected to the ADC input.
reading the DR register will read the alternate function output status.
the alternate function reads the pin status given by the DR register content.
Not implemented in
true open drain
I/O ports
Not implemented in
true open drain
I/O ports
Not implemented in
true open drain
I/O ports
I/O port configurations
Pad
Pad
Pad
V
V
R
DD
DD
R
PU
PU
V
R
DD
PU
Hardware configuration
Pull-up
condition
Interrupt
condition
Alternate
Alternate
enable
enable
register
DR
register
register
DR register access
External interrupt
source (ei
DR
DR
DR register access
DR register access
Alternate
Alternate
output
output
ST72323 ST72323L
W
R
x
)
R/W
R/W
Alternate input
Analog input
Data bus
Data bus
Data bus