Datasheet

Section 9 I/O Ports
Rev. 2.00 Jul. 04, 2007 Page 162 of 692
REJ09B0309-0200
9.2.3 Port Pull-Up Control Register 3 (PUCR3)
PUCR3 controls the pull-up MOS of port 3 pins in bit units.
Bit Bit Name
Initial
Value
R/W Description
7
6
PUCR37
PUCR36
0
0
R/W
R/W
When a PCR3 bit is cleared to 0, setting the
corresponding PUCR3 bit to 1 turns on the pull-up MOS
for the corresponding pin, while clearing the bit to 0
turns off the pull-up MOS.
5 to 1  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
0 PUCR30 0 R/W When a PCR3 bit is cleared to 0, setting the
corresponding PUCR3 bit to 1 turns on the pull-up MOS
for the corresponding pin, while clearing the bit to 0
turns off the pull-up MOS.
9.2.4 Port Mode Register 3 (PMR3)
PMR3 controls the selection of functions for port 3 pins.
Bit Bit Name
Initial
Value
R/W Description
7 to 1  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
0 TMOW 0 R/W P30/SCK32/TMOW/CLKOUT Pin Function Switch
Selects whether pin P30/SCK32/TMOW/CLKOUT is
used as P30/SCK32 or as TMOW/CLKOUT.
0: P30/SCK32 I/O pin
1: TMOW/CLKOUT output pin