170
8.10
Port 9
8.10.1
Overview
Port 9 is a 4-bit I/O port. Figure 8-9 shows its pin configuration.
P9
3
P9
2
P9
1
P9
0
Port 9
Figure 8-9 Port 9 Pin Configuration
8.10.2
Register Configuration and Description
Table 8-26 shows the port 9 register configuration.
Table 8-26 Port 9 Registers
Name
Abbrev.
R/W
Initial Value
Address
Port data register 9
PDR9
R/W
H'00
H'FFDC
Port control register 9
PCR9
R
H'F0
H'FFEC
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