Datasheet

Section 9 I/O Ports
Rev. 2.00 Jul. 04, 2007 Page 184 of 692
REJ09B0309-0200
9.8.2 Port Control Register 9 (PCR9)
PCR9 selects inputs/outputs in bit units for pins of
port 9.
Bit Bit Name
Initial
Value
R/W Description
7 to 4  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
3
2
1
0
PCR93
PCR92
PCR91
PCR90
0
0
0
0
W
W
W
W
Setting a PCR9 bit to 1 makes the corresponding pin an
output pin, while clearing the bit to 0 makes the pin an
input pin. The settings in PCR9 and in PDR9 are valid
when the corresponding pin is designated as a general
I/O pin.
PCR9 is a write-only register. These bits are always
read as 1.
9.8.3 Port Mode Register 9 (PMR9)
PMR9 controls the selection of functions for port 9 pins.
Bit Bit Name
Initial
Value
R/W Description
7 to 4  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
3  0 R/W Reserved
Although this bit is readable/writable, 1 should not be
written to this bit.
2 IRQ4 0 R/W P92/IRQ4 Pin Function Switch
Selects whether pin P92/IRQ4 is used as P92 or as
IRQ4.
0: P92 I/O pin
1: IRQ4 input pin