Port 8; Port 8 Data Direction Register (P8Ddr) - Renesas H8S/2437 Hardware Manual

7.9

Port 8

Port 8 is an 8-bit I/O port. Port 8 pins also function as external trigger input pins for the A/D
converter, PWMX output pins, SCI_3, SCI_4, IIC3_0, and IIC3_1 I/O pins, and TPU I/O pins.
The output format for P80 to P83 which are general I/O ports is NMOS push-pull output.
Port 8 has the following registers.

• Port 8 data direction register (P8DDR)

• Port 8 data register (P8DR)
• Port 8 register (PORT8)
7.9.1 Port 8 Data Direction Register (P8DDR)
The individual bits in P8DDR specify input or output for the pins of port 8. The read value is
undefined.
Bit Bit Name
7 P87DDR
6 P86DDR
5 P85DDR
4 P84DDR
3 P83DDR
2 P82DDR
1 P81DDR
0 P80DDR
Initial Value R/W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
Description
While a general I/O port function is selected, the
corresponding port 8 pin is an output port when a
P8DDR bit is set to 1, and an input port when
cleared to 0.
Rev. 1.00, 09/03, page 183 of 704