Specifications

Parallel I/O
PROGRAMMABLE REGISTERS
The 24 parallel I/O signals are accessible through three programmable
registers. The address of each of the registers is shown in Table 12-1.
Table 12-1
Parallel I/O Register Addressing.
Address
(hex) Register Operation
0200h Parallel Port 0 Read/Write
0210h Parallel Port 1 Read/Write
0220h Parallel Port 2 Read/Write
12-5