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HD404369F Scheda tecnica(PDF) 97 Page - Renesas Technology Corp

Il numero della parte HD404369F
Spiegazioni elettronici  microcomputer has an A/D converter
PDF  117 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404369F Scheda tecnica(HTML) 97 Page - Renesas Technology Corp

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HD404369 Series
95
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes, as shown in figure 80 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 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
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 80 RAM Addressing Modes



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