Port 9; Port 9 Data Direction Register (P9Ddr) - Renesas H8S Series Hardware Manual

Section 8 I/O Ports
8.9

Port 9

Port 9 is an 8-bit I/O port. Port 9 pins also function as the interrupt input pins, A/D converter
inputs, sub-clock input pin, IIC_0 I/O pin, and the system clock output pin (φ). The output format
for P97 is NMOS push-pull output. The output format for SDA0 is NMOS open-drain output, and
direct bus drive is possible. Port 9 has the following registers.

• Port 9 data direction register (P9DDR)

• Port 9 data register (P9DR)
• Port 9 pull-up MOS control register (P9PCR)
8.9.1 Port 9 Data Direction Register (P9DDR)
The individual bits of P9DDR specify input or output for the pins of port 9.
Bit Bit Name
7 P97DDR
6 P96DDR
5 P95DDR
4 P94DDR
3 P93DDR
2 P92DDR
1 P91DDR
0 P90DDR
Rev. 3.00 Jul. 14, 2005 Page 196 of 986
REJ09B0098-0300
Initial Value R/W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
Description
The corresponding port 9 pins are output ports
when the P9DDR bits are set to 1, and input ports
when cleared to 0.
When this bit is set to 1, the corresponding port 96
pin is the system clock output pin (φ).
The corresponding port 9 pins are output ports
when the P9DDR bits are set to 1, and input ports
when cleared to 0.