HD6433937 Datasheet, PDF (180/521 Pages) Hitachi Semiconductor – Hardware Manual

8.9 Port 8
8.9.1 Overview
Port 8 is an 8-bit I/O port configured as shown in figure 8-8.
P8₇
P8₆
P8₅
P8₄
Port 8
P8₃
P8₂
P8₁
P8₀
Figure 8-8 Port 8 Pin Configuration
8.9.2 Register Configuration and Description
Table 8-23 shows the port 8 register configuration.
Table 8-23 Port 8 Registers
Name
Port data register 8
Port control register 8
Abbrev. R/W
PDR8
R/W
PCR8
W
Initial Value
H'00
H'00
Address
H'FFDB
H'FFEB
1. Port data register 8 (PDR8)
Bit
Initial value
Read/Write
7
P8 ₇
0
R/W
6
P8 ₆
0
R/W
5
P8₅
0
R/W
4
P8 ₄
0
R/W
3
P8₃
0
R/W
2
P8₂
0
R/W
1
P8₁
0
R/W
0
P8 ₀
0
R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8₇ to P8₀. If port 8 is read while PCR8
bits are set to 1, the values stored in PDR8 are read, regardless of the actual pin states. If port 8 is
read while PCR8 bits are cleared to 0, the pin states are read.
Upon reset, PDR8 is initialized to H'00.
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