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88 User’s Manual U10676EJ3V0UM
CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
6.1 Digital I/O Ports
The
µ
PD754244 uses memory mapped I/O, and all the I/O ports are mapped to the data memory space.
Figure 6-1. Data Memory Address of Digital Ports
FF0H
FF1H
FF2H
FF3H
FF4H
FF5H
FF6H
FF7H
FF8H
P33
P63
P73
–
Address 3
P32
P62
P72
–
2
P31
P61
P71
–
1
P30
P60
P70
P80
0
Port 3
Port 6
Port 7
Port 8
—
—
—
—
—
Table 6-2 lists the instructions that manipulate the I/O ports. Ports 3 and 6 can be manipulated in 4-I/O
and
1-bit units. They are used for various control operations.
Examples 1. To test the status of P73 and outputs different values to port 3 depending on the result
SKT PORT7.3 ; Skips if bit 3 of port 7 is 1
MOV XA, #8H ; XA ← 8H
MOV XA, #4H ; XA ← 4H
SEL MB15 ; or CLR1 MBE
OUT PORT3, A ; Port 3 ← A
2. SET1 PORT6.@L ; Sets the bits of port 6 specified by the L register to “1”
String effect