Datasheet

Section 9 I/O Ports
Rev. 3.00 Mar. 15, 2006 Page 126 of 526
REJ09B0060-0300
9.4.4 Port Pull-Up Control Register 5 (PUCR5)
PUCR5 controls the pull-up MOS in bit units of the pins set as the input ports.
Bit Bit Name
Initial
Value R/W Description
7
6


0
0


Reserved
These bits are always read as 0.
5
4
3
2
1
0
PUCR55
PUCR54
PUCR53
PUCR52
PUCR51
PUCR50
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
Only bits for which PCR5 is cleared are valid. The pull-
up MOSs of the corresponding pins enter the on-state
when these bits are set to 1, while they enter the off-
state when these bits are cleared to 0.
9.4.5 Pin Functions
The correspondence between the register specification and the port functions is shown below.
• P57/SCL pin
Register ICCR PCR5
Bit Name ICE PCR57 Pin Function
Setting Value 0 0 P57 input pin
1 P57 output pin
1 X SCL I/O pin
[Legend] X: Don't care.
SCL performs the NMOS open-drain output, that enables a direct bus drive.