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HD4046212RFS 데이터시트(PDF) 19 Page - Renesas Technology Corp

부품명 HD4046212RFS
상세설명  AS Microcomputer Incorporating a DTMF Generator Circuit
PDF  157 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD4046212RFS 데이터시트(HTML) 19 Page - Renesas Technology Corp

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HD404629R Series
17
Functional Description
Registers and Flags
The MCU has nine registers and two flags for CPU operations. They are shown in figure 8 and described
below.
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: $0000,
R/W not possible
Stack pointer
Initial value: $3FF, R/W not possible
0
0
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, R/W not possible
Figure 8 Registers and Flags
Accumulator (A) and B Register (B): A and B are 4-bit registers, and are used to hold the results of ALU
(arithmetic and logical unit) operations and to transfer data between memory, I/O ports, and other registers.
W Register (W), X Register (X), and Y Register (Y): W is a 2-bit register and X and Y are 4-bit
registers. These registers are used in RAM register indirect addressing. The Y register is also used in D port
addressing.



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