Datasheet

Section 9 I/O Ports

Rev.6.00 Mar. 18, 2009 Page 379 of 980

REJ09B0050-0600

9.10.4 Port C MOS Pull-Up Control Register (PCPCR)

PCPCR controls the on/off state of MOS input pull-up of port C. PCPCR is valid in modes 4 and

Bit Bit Name Initial Value R/W Description

7 PC7PCR 0 R/W

6 PC6PCR 0 R/W

5 PC5PCR 0 R/W

4 PC4PCR 0 R/W

When PCDDR = 0 (input port), setting the

corresponding bit to 1 turns on the MOS input pull-

up for that pin.

3 PC3PCR 0 R/W

2 PC2PCR 0 R/W

1 PC1PCR 0 R/W

0 PC0PCR 0 R/W

9.10.5 Pin Functions

Port C pins also function as the pins for address outputs. The correspondence between the register

specification and the pin functions is shown below.

• PC7/A7, PC6/A6, PC5/A5, PC4/A4, PC3/A3, PC2/A2, PC1/A1, PC0/A0

The pin function is switched as shown below according to the operating mode, bit EXPE, and bit

PCDDR.

Operating

mode

1, 2 4 7

EXPE — — 0 1

PCnDDR — 0 1 0 1 0 1

Pin function Address

output

PCn input Address

output

PCn input PCn output PCn input Address

output

Legend: n = 7 to 0