Datasheet

Section 9 I/O Ports
Rev.6.00 Sep. 27, 2007 Page 407 of 1268
REJ09B0220-0600
Port B MOS Pull-Up Control Register (PBPCR)
Bit : 7 6 5 4 3 2 1 0
PB7PCR PB6PCR PB5PCR PB4PCR PB3PCR PB2PCR PB1PCR PB0PCR
Initial value : 0 0 0 0 0 0 0 0
R/W : R/W R/W R/W R/W R/W R/W R/W R/W
PBPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port B on an individual bit basis.
When a PBDDR bit is cleared to 0 (input port setting) in mode 6 or 7, setting the corresponding
PBPCR bit to 1 turns on the MOS input pull-up for the corresponding pin.
PBPCR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior state in
software standby mode.
9.9.3 Pin Functions
Modes 4 and 5: In modes 4 and 5, port B pins are automatically designated as address outputs.
Port B pin functions in modes 4 and 5 are shown in figure 9.9.
A
15
(output)
A
14
(output)
A
13
(output)
A
12
(output)
A
11
(output)
A
10
(output)
A
9
(output)
A
8
(output)
Port B
Figure 9.9 Port B Pin Functions (Modes 4 and 5)