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HD404814FS датащи(PDF) 17 Page - Renesas Technology Corp

номер детали HD404814FS
подробное описание детали  4-Bit Single-Chip Microcomputer
PDF  100 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404814FS датащи(HTML) 17 Page - Renesas Technology Corp

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HD404818 Series
15
Functional Description
Registers and Flags
The MCU provides ten registers and two flags for CPU operations. They are illustrated in figure 5 and
described in the following paragraphs.
30
30
30
30
30
30
0
0
0
13
95
1
(B)
(A)
(W)
(X)
(Y)
(SPX)
(SPY)
(CA)
(ST)
(PC)
(SP)
11
11
Accumulator
B register
W register
X register
Y register
SPX register
SPY register
Carry
Status
Program counter
Initial value: 0,
no R/W
Stack pointer
Initial value: $3FF, no R/W
0
(V)
0
0
Initial value: Undefined, R/W
Initial value: Undefined, R/W
V register
Initial value: 0, R/W
Initial value: Undefined, R/W
Initial value: Undefined, R/W
Initial value: Undefined, R/W
Initial value: Undefined, R/W
Initial value: Undefined, R/W
Initial value: Undefined, R/W
Initial value: 1, no R/W
Figure 5 Registers and Flags
Accumulator (A), B Register (B): The accumulator and B register are 4-bit registers which hold the
results of the arithmetic logic unit (ALU), and exchange data between memory, I/O, and other registers.



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