Port 3; Port 3 Data Direction Register (P3Ddr) - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

10.3

Port 3

Port 3 is a 6-bit I/O port that also has other functions. The port 3 has the following registers.

• Port 3 data direction register (P3DDR)

• Port 3 data register (P3DR)
• Port 3 register (PORT3)
• Port 3 open drain control register (P3ODR)
• Port function control register 2(PFCR2)
10.3.1 Port 3 Data Direction Register (P3DDR)
The individual bits of P3DDR specify input or output for the pins of port 3.
P3DDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name
7 —
6 —
5 P35DDR
4 P34DDR
3 P33DDR
2 P32DDR
1 P31DDR
0 P30DDR
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 429 of 904