Datasheet

Section 8 I/O Ports
Rev. 2.00 Aug. 20, 2008 Page 320 of 1198
REJ09B0403-0200
8.2.9 Port 9
Port 9 is an 8-bit I/O port. Port 9 pins can function as the bus control input/output pins. The pin
functions change according to the operating mode. Port 9 has the following registers.
• Port 9 data direction register (P9DDR)
• Port 9 data register (P9DR)
(1) Port 9 Data Direction Register (P9DDR)
The individual bits of P9DDR specify input or output for the port 9 pins.
Bit Bit Name Initial Value R/W Description
7 P97DDR 0 W
6 P96DDR 0 W
5 P95DDR 0 W
4 P94DDR 0 W
3 P93DDR 0 W
2 P92DDR 0 W
1 P91DDR 0 W
0 P90DDR 0 W
If port 9 pins are specified for use as the general I/O
port, the corresponding pins function as output port
when the P9DDR bits are set to 1, and as input port
when cleared to 0.