Datasheet

Section 9 I/O Ports

Rev.6.00 Mar. 18, 2009 Page 375 of 980

REJ09B0050-0600

9.9.4 Port B MOS Pull-Up Control Register (PBPCR)

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

Bit Bit Name Initial Value R/W Description

7 PB7PCR 0 R/W

6 PB6PCR 0 R/W

5 PB5PCR 0 R/W

4 PB4PCR 0 R/W

When PBDDR = 0 (input port), setting the

corresponding bit to 1 turns on the MOS input pull-

up for that pin.

3 PB3PCR 0 R/W

2 PB2PCR 0 R/W

1 PB1PCR 0 R/W

0 PB0PCR 0 R/W

9.9.5 Pin Functions

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

specification and the pin functions is shown below.

• PB7/A15, PB6/A14, PB5/A13, PB4/A12, PB3/A11, PB2/A10, PB1/A9, PB0/A8

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

PBDDR.

Operating

mode

1, 2 4 7

EXPE — — 0 1

PBnDDR — 0 1 0 1 0 1

Pin function Address

output

PBn input Address

output

PBn input PBn output PBn input Address

output