Pin Functions; Pin States - Renesas Hitachi H8S/2194 Series Hardware Manual

(3) Port Data Register 7 (PDR7)
Bit : 7
PDR77
Initial value : 0
R/W
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
0 0
1
1
*
Note: Don't care.
*
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
P77/PPG7 High-
to impedance
P70/PPG0
Rev. 2.0, 11/00, page 282 of 1037
6 5
PDR76 PDR75
0 0
R/W R/W
Pin Function
P7n input pin
P7n output pin
PPGn input pin
Active Sleep
Operation Holding
4 3
PDR74 PDR73 PDR72
0 0
R/W R/W
Standby Watch
High- High-
impedance impedance
2 1
PDR71 PDR70
0 0
R/W R/W R/W
(n = 7 to 0)
Subactive Subsleep
Operation Holding
0
0