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HD404374FT Datasheet(PDF) 123 Page - Renesas Technology Corp

Part # HD404374FT
Description  Low-Voltage AS Microcomputers with On-Chip A/D Converter
PDF  161 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404374FT Datasheet(HTML) 123 Page - Renesas Technology Corp

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HD404374/HD404384/HD404389/HD404082/HD404084 Series
Rev.5.00, Sep.11.2003, page 123 of 161
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes, as shown in figure 75 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), which are located in 16 addresses from
$040 to $04F, are accessed with the LAMR and XMRA instructions.
AP
9
AP
0
W1
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
00
010
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
543
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
W0
X3
X2
X1
X0
Y
3
Y
2
Y
1
m
2
m
1
m
0
Figure 75 RAM Addressing Modes



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