Pin Functions - Hitachi H8/3032 Series Hardware Manual

Port 8 Data Register (P8DR): P8DR is an 8-bit readable/writable register that stores data for pins
P8
3
Bit
Initial value
Read/Write
When a bit in P8DDR is set to 1, if port 8 is read the value of the corresponding P8DR bit is
returned directly. When a bit in P8DDR is cleared to 0, if port 8 is read the corresponding pin level
is read.
Bits 7 to 4 are reserved. Bits 7 to 5 cannot be modified and always read 1. Bit 4 can be written and
read, but it cannot be used for port input or output. If bit 4 of P8DDR is read while its value is 1, bit
4 of P8DR is read directly. If bit 4 of P8DDR is read while its value is 0, it always reads 1.
P8DR is initialized to H'E0 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.

7.8.3 Pin Functions

The port 8 pins are also used for IRQ
Downloaded from Elcodis.com electronic components distributor
to P8 .
0
7 6
— —
1 1
— —
Reserved bits
5 4 3
— — P8
3
1 0 0
— R/W R/W
Port 8 data 4 to 0
These bits store data
for port 8 pins
to IRQ . Table 7-12 describes the selection of pin functions.
3 0
148
2 1 0
P8 P8 P8
2 1 0
0 0 0
R/W R/W R/W