HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 274

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

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.
In modes 5 to 7, when a P5DDR bit is cleared to 0 (selecting generic input), if the corresponding
bit from P5
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
1
2
3
4
5
6
7
Legend
Off:
On/off: The input pull-up MOS transistor is on if P5PCR = 1 and P5DDR = 0. Otherwise, it is off.
Bit
Initial value
Read/Write
The input pull-up MOS transistor is always off.
Reset
Off
Off
3
PCR to P5
—
—
7
1
Hardware Standby Mode
Off
Off
0
PCR is set to 1, the input pull-up MOS transistor is turned on.
Reserved bits
—
—
6
1
—
—
5
1
261
—
—
4
1
Off
On/off
Software Standby Mode
Port 5 input pull-up MOS control 3 to 0
These bits control input pull-up MOS
transistors built into port 5
P5 PCR
R/W
3
3
0
P5 PCR
R/W
2
2
0
P5 PCR
R/W
1
1
0
Other Modes
Off
On/off
P5 PCR
R/W
0
0
0