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參數(shù)資料
| 型號(hào)： | HD404618TF |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer |
| 中文描述： | 4位單片機(jī) |
| 文件頁(yè)數(shù)： | 70/89頁(yè) |
| 文件大小： | 358K |
| 代理商： | HD404618TF |
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HD404618 Series
70
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes, as shown in figure 44 and described below.
Register Indirect Addressing Mode:
The contents of the W, X, and Y registers (10 bits in total) are used
as a RAM address.
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 as a RAM address.
Memory Register Addressing Mode:
The memory registers (MR), consisting of 16 digits from $040 to
$04F, are accessed with the LAMR and XMRA instructions.
AP
9
AP
8
AP
7
AP
6
AP
5
AP
4
AP
3
AP
2
AP
1
AP
0
W
1
W
0
X
3
X
2
X
1
X
0
Y
3
Y
2
Y
1
Y
0
W register
X register
Y register
RAM address
Register Indirect Addressing
AP
9
AP
8
AP
7
AP
6
AP
5
AP
4
AP
3
AP
2
AP
1
AP
0
RAM address
Direct Addressing
d
9
d
8
d
7
d
6
d
5
d
4
d
3
d
2
d
1
d
0
2nd word of instruction
Opcode
1st word of instruction
AP
9
AP
8
AP
7
AP
AP
5
AP
4
AP
3
AP
2
AP
1
AP
0
RAM address
Memory Register Addressing
m
3
m
2
m
1
m
0
Opcode
Instruction
0
0
0
1
0
0
6
Figure 44 RAM Addressing Modes
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