參數(shù)資料
型號(hào): HD404638R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁(yè)數(shù): 112/133頁(yè)
文件大?。?/td> 803K
代理商: HD404638R
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HD404639R Series
112
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes, as shown in figure 94 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. When the area from $090 to $25F is used, a bank must be selected by the bank register
(V: $03F).
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), 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 Direct 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 94 RAM Addressing Modes
相關(guān)PDF資料
PDF描述
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