HD6433044 Datasheet, PDF (274/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Bits 7 to 4 are reserved. They cannot be modified and are always read as 1.
P5DR is initialized to H'F0 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Port 5 Input Pull-Up MOS Control Register (P5PCR): P5PCR is an 8-bit readable/writable
register that controls the MOS input pull-up MOS transistors in port 5.
Bit
7
6
5
4
3
2
1
0
—
—
—
— P5₃PCR P5₂PCR P5₁PCR P5₀PCR
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W R/W R/W R/W
Reserved bits
Port 5 input pull-up MOS control 3 to 0
These bits control input pull-up MOS
transistors built into port 5
In modes 5 to 7, when a P5DDR bit is cleared to 0 (selecting generic input), if the corresponding
bit from P5₃PCR to P5₀PCR is set to 1, the input pull-up MOS transistor is turned on.
P5PCR is initialized to H'F0 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting.
Table 9-9 summarizes the states of the input pull-ups MOS in each mode.
Table 9-9 Input Pull-Up MOS Transistor States (Port 5)
Mode Reset Hardware Standby Mode Software Standby Mode Other Modes
1
Off
Off
2
3
4
Off
Off
5
Off
Off
6
7
On/off
On/off
Legend
Off: The input pull-up MOS transistor is always off.
On/off: The input pull-up MOS transistor is on if P5PCR = 1 and P5DDR = 0. Otherwise, it is off.
261