h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 264
h8s-2138
Manufacturer Part Number
h8s-2138
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2138.pdf
(1061 pages)
- Current page: 264 of 1061
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Section 8 I/O Ports
Port 3 Data Register (P3DR)
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)
P3PCR is an 8-bit readable/writable register that controls the port 3 on-chip 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 in slave mode (when the host interface is
enabled).
Rev. 4.00 Jun 06, 2006 page 210 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
P37PCR
P37DR
R/W
R/W
7
0
7
0
P36PCR
P36DR
R/W
R/W
6
0
6
0
P35PCR
P35DR
R/W
R/W
5
0
5
0
P34PCR
P34DR
R/W
R/W
4
0
4
0
P33PCR
P33DR
R/W
R/W
3
0
3
0
P32PCR
P32DR
R/W
R/W
2
0
2
0
P31PCR
P31DR
R/W
R/W
1
0
1
0
P30PCR
P30DR
R/W
R/W
0
0
0
0
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