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HD404612FS Datasheet(PDF) 72 Page - Renesas Technology Corp

Part # HD404612FS
Description  4-Bit Single-Chip Microcomputer
PDF  91 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404612FS Datasheet(HTML) 72 Page - Renesas Technology Corp

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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
W1 W0
X3
X2
X1
X0
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
00
010
0
6
Figure 44 RAM Addressing Modes



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