![Hitachi H8/3935 Hardware Manual Download Page 178](http://html.mh-extra.com/html/hitachi/h8-3935/h8-3935_hardware-manual_140486178.webp)
166
1. Port data register 7 (PDR7)
Bit
Initial value
Read/Write
7
P7
0
R/W
6
P7
0
R/W
5
P7
0
R/W
4
P7
0
R/W
3
P7
0
R/W
0
P7
0
R/W
2
P7
0
R/W
1
P7
0
R/W
7
6
5
4
3
2
1
0
PDR7 is an 8-bit register that stores data for port 7 pins P7
7
to P7
0
. If port 7 is read while PCR7
bits are set to 1, the values stored in PDR7 are read, regardless of the actual pin states. If port 7 is
read while PCR7 bits are cleared to 0, the pin states are read.
Upon reset, PDR7 is initialized to H'00.
2. Port control register 7 (PCR7)
Bit
Initial value
Read/Write
7
PCR7
0
W
6
PCR7
0
W
5
PCR7
0
W
4
PCR7
0
W
3
PCR7
0
W
0
PCR7
0
W
2
PCR7
0
W
1
PCR7
0
W
7
6
5
4
3
2
1
0
PCR7 is an 8-bit register for controlling whether each of the port 7 pins P7
7
to P7
0
functions as an
input pin or output pin. Setting a PCR7 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR7 is initialized to H'00.
PCR7 is a write-only register, which always reads as all 1s.
Summary of Contents for H8/3935
Page 1: ......
Page 2: ......
Page 4: ......
Page 24: ...12 ...
Page 96: ...84 ...
Page 142: ...130 ...
Page 144: ...132 ...
Page 252: ...240 ...
Page 326: ...314 ...
Page 340: ...328 ...
Page 520: ...508 ...