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Section 8 I/O Ports
Bit
Bit Name
Initial Value
R/W
Note: The lower four bits are valid and the upper four bits are reserved for port 2 input buffer control register (P2ICR).
The lower seven bits are valid and the upper one bit is reserved for port 6 input buffer control register (P6ICR).
The upper seven bits are valid and the lower one bit is reserved for port A input buffer control register (PAICR).
8.1.5
Pull-Up MOS Control Register (PnPCR) (n = D, H, J, and K)
PCR is an 8-bit readable/writable register that controls on/off of the port input pull-up MOS.
If a bit in PCR is set to 1 while the pin is in input state, the input pull-up MOS corresponding to
the bit in PCR is turned on. Table 8.3 shows the input pull-up MOS status.
The initial value of PCR is H'00.
Bit
Bit Name
Initial Value
R/W
Table 8.3
Input Pull-Up MOS State
Port
Pin State
Port D
On-chip peripheral module output
Port input
Port H
Port output
Port input
Port J
On-chip peripheral module output
Port input
Port K
On-chip peripheral module output
Port input
[Legend]
OFF:
The input pull-up MOS is always off.
ON/OFF:
If PCR is set to 1, the input pull-up MOS is on; if PCR is cleared to 0, the input pull-up
MOS is off.
Rev. 3.00 Mar. 14, 2006 Page 214 of 804
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7
6
Pn7ICR
Pn6ICR
Pn5ICR
0
0
R/W
R/W
7
6
Pn7PCR
Pn6PCR
Pn5PCR
0
0
R/W
R/W
5
4
3
Pn4ICR
Pn3ICR
0
0
0
R/W
R/W
R/W
5
4
3
Pn4PCR
Pn3PCR
0
0
0
R/W
R/W
R/W
Reset
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
2
1
Pn2ICR
Pn1ICR
Pn0ICR
0
0
R/W
R/W
2
1
Pn2PCR
Pn1PCR
Pn0PCR
0
0
R/W
R/W
Software
Other
Standby Mode
Operation
OFF
OFF
ON/OFF
ON/OFF
OFF
OFF
ON/OFF
ON/OFF
OFF
OFF
ON/OFF
ON/OFF
OFF
OFF
ON/OFF
ON/OFF
0
0
R/W
0
0
R/W
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