Datasheet

Section 9 I/O Ports
Rev. 2.00 Sep. 23, 2005 Page 100 of 444
REJ09B0068-0200
9.1.4 Port Pull-Up Control Register 1 (PUCR1)
PUCR1 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
5
4
3
2
1
0
PUCR17
PUCR16
PUCR15
PUCR14

PUCR12
PUCR11
PUCR10
0
0
0
0
1
0
0
0
R/W
R/W
R/W
R/W

R/W
R/W
R/W
Only bits for which PCR1 is cleared are valid. The pull-
up MOS of P17 to P14 and P12 to P10 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.
Bit 3 is a reserved bit. This bit is always read as 1.
9.1.5 Pin Functions
The correspondence between the register specification and the port functions is shown below.
• P17/IRQ3/TRGV pin
Register PMR1 PCR1
Bit Name IRQ3 PCR17 Pin Function
Setting value 0 0 P17 input pin
1 P17 output pin
1 X IRQ3 input/TRGV input pin
[Legend]
X: Don't care.