參數(shù)資料
型號: HD404458
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 104/120頁
文件大?。?/td> 692K
代理商: HD404458
HD404459 Series
104
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes (figure 84).
Register Indirect Addressing Mode:
The contents of the W, X, and Y registers (10 bits in total) are used
for RAM addressing.
Direct Addressing Mode:
A direct addressing instruction consists of two words. The first word contains
the opcode, and the contents of the second word (10 bits) are used for RAM addressing.
Memory Register Addressing Mode:
The memory registers (MR), which are located in 16 addresses from
$040 to $04F, are accessed with the LAMR and XMRA instructions.
AP
9
AP
0
W
1
Y
0
W register
X register
Y register
RAM address
Register Indirect Addressing
AP
9
AP
0
RAM address
Direct Addressing
d
9
d
0
2nd word of Instruction
Opcode
1st word of Instruction
AP
9
AP
0
RAM address
Memory Register Addressing
m
3
Opcode
Instruction
0
0
0
1
0
0
AP
8
AP
7
AP
AP
5
AP
4
6
AP
3
AP
2
AP
1
AP
AP
AP
AP
AP
AP
AP
AP
8
7
6
5
4
3
2
1
d
8
d
7
d
6
d
5
d
4
d
3
d
2
d
1
AP
8
AP
7
AP
6
AP
5
AP
4
AP
3
AP
2
AP
1
W
0
X
3
X
2
X
1
X
0
Y
3
Y
2
Y
1
m
2
m
1
m
0
Figure 84 RAM Addressing Modes
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