HD6413002 Datasheet, PDF (258/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

Port 4 Data Register (P4DR): P4DR is an 8-bit readable/writable register that stores data for
pins P4₇ to P4₀.
Bit
Initial value
Read/Write
7
P4 ₇
0
R/W
6
5
4
3
2
P4 ₆
P4 ₅
P4 ₄
P4 ₃
P4 ₂
0
0
0
0
0
R/W R/W R/W R/W R/W
1
P4 ₁
0
R/W
0
P4 ₀
0
R/W
Port 4 data 7 to 0
These bits store data for port 4 pins
When a bit in P4DDR is set to 1, if port 4 is read the value of the corresponding P4DR bit is
returned directly, regardless of the actual state of the pin. When a bit in P4DDR is cleared to 0, if
port 4 is read the corresponding pin level is read. This applies in both 8-bit and 16-bit bus modes.
P4DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Port 4 Input Pull-Up Control Register (P4PCR): P4PCR is an 8-bit readable/writable register
that controls the MOS input pull-up transistors in port 4.
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P4₇PCR P4₆PCR P4₅PCR P4₄PCR P4₃PCR P4₂PCR P4₁PCR P4₀PCR
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Port 4 input pull-up control 7 to 0
These bits control input pull-up transistors built into port 4
In 8-bit bus mode, when a P4DDR bit is cleared to 0 (selecting generic input), if the
corresponding P4PCR bit is set to 1, the input pull-up transistor is turned on.
P4PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting.
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