HD64F3048F16 Datasheet, PDF (307/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
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.
Bits 7 to 4 are reserved. They cannot be modified and are always read as 1.
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
Off
Off
2
3
4
5
Off
Off
On/off
On/off
6
7
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.
Rev. 3.00 Sep 27, 2006 page 279 of 872
REJ09B0325-0300