參數(shù)資料
型號: HCD40C4344R
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微電腦(4位單片微計(jì)算機(jī))
文件頁數(shù): 84/100頁
文件大小: 610K
代理商: HCD40C4344R
HD404344R Series/HD404394 Series
84
Addressing Mode for P Instruction:
By using the P instruction, the ROM data determined by table data
addressing can be referenced. The lower-order 8 bits of ROM data are written in the accumulator and the B
register when bit 8 of the ROM data is 1, and are written in the R1 and R2 port output registers when bit 9
is 1. If bit 8 and bit 9 are both 1, the ROM data is simultaneously written into the accumulator, the B
register, and the R1 and R2 port output registers. (See figure 64.)
The program counter is not affected by the P instruction.
Accumulator
Referenced ROM address
Address
B register
0
0
[P]
Instruction
Opcode
RO
8
= 1
Accumulator, B register
ROM data
Pattern Output
ROM data
RO
9
= 1
Output registers R1, R2
p
3
p
2
p
1
p
0
B
3
B
2
B
1
B
0
A
3
A
2
A
1
A
0
RA
13
RA
12
RA
11
RA
10
RA
9
RA
8
RA
7
RA
6
RA
5
RA
4
RA
3
RA
2
RA
1
RA
0
RO
9
RO
8
RO
7
RO
6
RO
5
RO
4
RO
3
RO
2
RO
1
RO
0
B
3
B
2
B
1
B
0
A
3
A
2
A
1
A
0
RO
9
RO
8
RO
7
RO
6
RO
5
RO
4
RO
3
RO
2
RO
1
RO
0
R2
3
R2
2
R2
1
R2
0
R1
3
R1
2
R1
1
R1
0
Figure 64 P Instruction
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