AT75C220
64
Figure 14. Parallel I/O Multiplexed with a Bid-directional Signal
Pad
PIO_OSR
1
0
1
0
PIO_PSR
PIO_ODSR
0
1
PIO_PSR
Event
Detection
PIO_PDSR
PIO_ISR
PIO_IMR
Peripheral
Output
Enable
Peripheral
Output
Peripheral
Input
PIOIRQ
Pad Output Enable
Pad Output
Pad Input
