HD64F2149 Datasheet, PDF (243/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Port 3 Data Register (P3DR)
Bit
Initial value
Read/Write
7
P37DR
0
R/W
6
P36DR
0
R/W
5
P35DR
0
R/W
4
P34DR
0
R/W
3
P33DR
0
R/W
2
P32DR
0
R/W
1
P31DR
0
R/W
0
P30DR
0
R/W
P3DR is an 8-bit readable/writable register that stores output data for the port 3 pins (P37 to P30).
If a port 3 read is performed while P3DDR bits are set to 1, the P3DR values are read directly,
regardless of the actual pin states. If a port 3 read is performed while P3DDR bits are cleared to 0,
the pin states are read.
P3DR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
Port 3 MOS Pull-Up Control Register (P3PCR)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P37PCR P36PCR P35PCR P34PCR P33PCR P32PCR P31PCR P30PCR
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P3PCR is an 8-bit readable/writable register that controls the port 3 built-in MOS input pull-ups
on a bit-by-bit basis.
In modes 2 and 3 (when EXPE = 0), the MOS input pull-up is turned on when a P3PCR bit is set
to 1 while the corresponding P3DDR bit is cleared to 0 (input port setting).
P3PCR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in
software standby mode.
The MOS input pull-up function cannot be used when the host interface is enabled.
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