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Rev. 2.0, 11/00, page 282 of 1037
(3) Port Data Register 7 (PDR7)
0
0
1
0
R/W
2
0
R/W
3
0
4
0
R/W
0
R/W
5
6
0
7
PDR74
PDR73
PDR72
PDR71
PDR70
0
R/W
PDR77
R/W
R/W
R/W
PDR76
PDR75
Bit :
Initial value :
R/W :
Port data register 7 (PDR7) stores the data for the pins P77 to P70 of port 7.
When PCR7 is 1 (output), the PDR7 values are directly read if port 7 is read. Accordingly, the
pin states are not affected. When PCR7 is 0 (input), the pin states are read if port 7 is read.
PDR7 is an 8-bit read/write enable register. When reset, PDR7 is initialized to H'00.
11.9.3
Pin Functions
This section describes the port 7 pin functions and their selection methods.
(1) P77/PPG7 to P70/PPG0
P77/PPG7 to P70/PPG0 are switched as shown below according to the PMR7n bit in PMR7
and the PCR7n bit in PCR7.
PMR7n
PCR7n
Pin Function
0
P7n input pin
0
1
P7n output pin
1
*
PPGn input pin
Note:
*
Don't care.
(n = 7 to 0)
11.9.4
Pin States
Table 11.25 shows the port 7 pin states in each operation mode.
Table 11.25 Port 7 Pin States
Pins
Reset
Active
Sleep
Standby
Watch
Subactive
Subsleep
P77/PPG7
to
P70/PPG0
High-
impedance
Operation
Holding
High-
impedance
High-
impedance
Operation
Holding
Содержание Hitachi H8S/2191
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