Renesas H8S/2158, User Manual

Page: 266 / 929

Section 9 I/O Ports
Rev. 3.00 Jan 25, 2006 page 212 of 872
REJ09B0286-0300
9.2 Port 2
Port 2 is an 8-bit I/O port. Port 2 pins also function as an address bus, PWM output pins, and
CompactFlash address output pins. Port 2 functions change according to the operating mode. Port
2 has the following registers.
•
Port 2 data direction register (P2DDR)
•
Port 2 data register (P2DR)
•
Port 2 pull-up MOS control register (P2PCR)
9.2.1 Port 2 Data Direction Register (P2DDR)
The individual bits of P2DDR specify input or output for the pins of port 2.
Bit Bit Name Initial Value R/W Description
7 P27DDR 0 W
6 P26DDR 0 W
5 P25DDR 0 W
4 P24DDR 0 W
3 P23DDR 0 W
2 P22DDR 0 W
1 P21DDR 0 W
0 P20DDR 0 W
In extended mode:
The corresponding port 2 pins are address output
or CompactFlash address output ports when the
P2DDR bits are set to 1, and input ports when
cleared to 0.
Pins function as the address output port
depending on the setting of bits IOSE and
CS256E in SYSCR.
In single-chip mode:
The corresponding port 2 pins are output ports or
PWM outputs when the P2DDR bits are set to 1,
and input ports when cleared to 0.