246
Port B MOS Pull-Up Control Register (PBPCR)
7
PB7PCR
0
R/W
6
PB6PCR
0
R/W
5
PB5PCR
0
R/W
4
PB4PCR
0
R/W
3
PB3PCR
0
R/W
0
PB0PCR
0
R/W
2
PB2PCR
0
R/W
1
PB1PCR
0
R/W
Bit
Initial value
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 2, 3, 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 power-on reset, and in hardware standby mode. It retains its
prior state after a manual reset, and in software standby mode.
Note: * Modes 1 to 3 are not available on the F-ZTAT version.
Modes 2, 3, 6, and 7 are not available on the ROMless version.
8.7.3
Pin Functions
Modes 1, 4, and 5*:
In modes 1, 4, and 5*, port B pins are automatically designated as address
outputs.
Port B pin functions in modes 1, 4, and 5 are shown in figure 8.10.
A
15
A
14
A
13
A
12
A
11
A
10
A
9
A
8
(output)
(output)
(output)
(output)
(output)
(output)
(output)
(output)
Port B
Figure 8.10 Port B Pin Functions (Modes 1, 4, and 5)*
Note: * Modes 1 to 3 are not available on the F-ZTAT version.
Modes 2, 3, 6, and 7 are not available on the ROMless version.