參數(shù)資料
型號: HCD404084
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機)
中文描述: 低電壓如同在微機芯片的A / D轉(zhuǎn)換器(帶片上的A / D轉(zhuǎn)換器的低壓微計算機)
文件頁數(shù): 31/162頁
文件大小: 482K
代理商: HCD404084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
31
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
3
0
(A)
3
0
(B)
1
0
(W)
3
0
(X)
3
0
(Y)
3
0
(SPX)
3
0
(SPY)
0
(CA)
0
(ST)
13
0
(PC)
5
0
(SP)
9
1
1
1
1
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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