NEC PD75402A Manuale Utente
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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
5.1
DIGITAL INPUT/OUTPUT PORTS
The
µ
PD75402A has the following digital input/output ports on chip: Ports 0 through 3, 5 and 6.
The
µ
PD75402A uses memory mapped I/O, and all input/output ports are mapped onto data memory space.
All data memory handling instructions can be used on all of the ports, and a wide variety of bit operations can
be performed in addition to 4-bit input/output.
Note
On the
µ
PD75402A it is not possible to perform 8-bit input/output by pairing two ports.
Fig. 5-1 Digital Input/Output Port Data Memory Addresses
Address
3
2
1
0
Symbol
FF0H
P03
P02
P01
P00
PORT0
FF1H
0
P12
0
P10
PORT1
FF2H
P23
P22
P21
P20
PORT2
FF3H
P33
P32
P31
P30
PORT3
FF5H
P53
P52
P51
P50
PORT5
FF6H
P63
P62
P61
P60
PORT6