參數(shù)資料
型號: HD40L4818
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 15/98頁
文件大小: 621K
代理商: HD40L4818
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.
3
0
3
0
3
0
3
0
3
0
3
0
0
0
0
13
9
5
1
(B)
(A)
(W)
(X)
(Y)
(SPX)
(SPY)
(CA)
(ST)
(PC)
(SP)
1
1
1
1
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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