HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 194

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

9.9 Port 8
9.9.1 Overview
Port 8 is an 8-bit input port that also receives inputs for the on-chip A/D converter. The pin
functions are the same in all MCU operating modes, as shown in figure 9-20.
9.9.2 Port 8 Registers
Register Configuration: Port 8 has only the data register described in table 9-15. Since it is
exclusively an input port, there is no data direction register.
Table 9-15 Port 8 Registers
Name
Port 8 data register
1. Port 8 Data Register (P8DR)—H'FE8F
Bit
Initial value
Read/Write
When the CPU reads P8DR it always reads the current status of each pin, except that during A/D
conversion, the pin being used for analog input reads 1 regardless of the input voltage at that pin.
Port
8
P8
R
7
0
7
P8
R
6
0
Figure 9-20 Pin Functions of Port 8
6
Abbreviation
P8DR
P8
P8
P8
P8
P8
P8
P8
P8
7
6
5
4
3
2
1
0
P8
R
5
0
(input) / AN
(input) / AN
(input) / AN
(input) / AN
(input) / AN
(input) / AN
(input) / AN
(input) / AN
5
177
P8
R
4
0
Read/Write
R
4
7
6
5
4
3
2
1
0
(input)
(input)
(input)
(input)
(input)
(input)
(input)
(input)
P8
R
3
0
3
Address
H'FE8F
P8
R
2
0
2
P8
R
1
0
1
P8
R
0
0
0