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H8/3021 Datasheet(PDF) 163 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 163 Page - Renesas Technology Corp

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7. I/O Ports
Rev.2.00 Mar. 22, 2007 Page 139 of 684
REJ09B0352-0200
Port 2 Data Register (P2DR): P2DR is an 8-bit readable/writable register that stores data for pins
P2
7 to P20.
Bit
Initial value
Read/Write
7
P2
0
R/W
Port 2 data 7 to 0
These bits store data for port 2 pins
7
6
P2
0
R/W
6
5
P2
0
R/W
5
4
P2
0
R/W
4
3
P2
0
R/W
3
2
P2
0
R/W
2
1
P2
0
R/W
1
0
P2
0
R/W
0
When a bit in P2DDR is set to 1, if port 2 is read the value of the corresponding P2DR bit is
returned directly, regardless of the actual state of the pin. When a bit in P2DDR is cleared to 0, if
port 2 is read the corresponding pin level is read.
P2DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Port 2 Input Pull-Up Control Register (P2PCR): P2PCR is an 8-bit readable/writable register
that controls the MOS input pull-up transistors in port 2.
Bit
Initial value
Read/Write
7
P2 PCR
0
R/W
Port 2 input pull-up control 7 to 0
These bits control input pull-up
transistors built into port 2
7
6
P2 PCR
0
R/W
6
5
P2 PCR
0
R/W
5
4
P2 PCR
0
R/W
4
3
P2 PCR
0
R/W
3
2
P2 PCR
0
R/W
2
1
P2 PCR
0
R/W
1
0
P2 PCR
0
R/W
0
When a P2DDR bit is cleared to 0 (selecting generic input) in modes 7 to 5, if the corresponding
bit from P2
7PCR to P20PCR is set to 1, the input pull-up transistor is turned on.
P2PCR 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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