HD6475328CG Datasheet, PDF (189/459 Pages) Hitachi Semiconductor – Manual Gives a Hardware Description

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.
P87 (input) / AN7 (input)
P86 (input) / AN6 (input)
P85 (input) / AN5 (input)
Port
P84 (input) / AN4 (input)
8
P83 (input) / AN3 (input)
P82 (input) / AN2 (input)
P81 (input) / AN1 (input)
P80 (input) / AN0 (input)
Figure 9-20 Pin Functions of Port 8
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
Abbreviation
P8DR
Read/Write
R
Address
H'FF8F
1. Port 8 Data Register (P8DR)—H'FF8F
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P87
P86
P85
P84
P83
P82
P81
P80
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
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.
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