HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 189

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [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 9-14. Since it is
exclusively an input port, there is no data direction register.
Table 9-14 Port 8 Registers
Name
Port 8 data register
1. Port 8 Data Register (P8DR)—H'FF8F
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 currently being converted reads “1” regardless of the actual 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
172
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'FF8F
P8
R
2
0
2
P8
R
1
0
1
P8
R
0
0
0