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HD404374FT Datasheet(PDF) 31 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) 31 Page - Renesas Technology Corp

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HD404374/HD404384/HD404389/HD404082/HD404084 Series
Rev.5.00, Sep.11.2003, page 31 of 161
Functional Description
Registers and Flags
The MCU has nine registers and two flags for CPU operations. they are shown in figure 7 and described
below.
Accumulator
B register
W register
X register
Y register
SPX register
SPY register
Carry flag
Status flag
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: Undefined, R/W
Initial value: Undefined, R/W
Initial value: 1, no R/W
Program counter
Initial value: $0000,
no R/W
Stack pointer
Initial value: $3FF, no R/W
30
(A)
30
(B)
10
(W)
30
(X)
30
(Y)
30
(SPX)
30
(SPY)
0
(CA)
0
(ST)
13
0
(PC)
50
(SP)
9
1111
Figure 7 Registers and Flags
Accumulator (A) and B register (B):
The accumulator and B register are 4-bit registers used to hold the result of an ALU operation, and for data
transfer to or from memory, an I/O area, or another register.



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