Port 8; Port 8 Data Direction Register (P8Ddr) - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

10.7

Port 8

Port 8 is a 6-bit I/O port that also has other functions. The port 8 has the following registers.

• Port 8 data direction register (P8DDR)

• Port 8 data register (P8DR)
• Port 8 register (PORT8)
10.7.1 Port 8 Data Direction Register (P8DDR)
The individual bits of P8DDR specify input or output for the pins of port 8.
P8DDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name
7 —
6 —
5 P85DDR
4 P84DDR
3 P83DDR
2 P82DDR
1 P81DDR
0 P80DDR
Initial Value R/W
0 —
0 —
0 W
0 W
0 W
0 W
0 W
0 W
Description
Reserved
These bits are always read as 0 and cannot be
modified.
When a pin function is specified to a general purpose
I/O, setting this bit to 1 makes the corresponding port
1 pin an output pin, while clearing this bit to 0 makes
the pin an input pin.
Rev. 1.0, 09/01, page 445 of 904