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MC908AP32CFAE 参数 Datasheet PDF下载

MC908AP32CFAE图片预览
型号: MC908AP32CFAE
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内容描述: [MC908AP32CFAE]
分类和应用:
文件页数/大小: 325 页 / 4102 K
品牌: FREESCALE [ Freescale ]
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Central Processor Unit (CPU)  
4.3 CPU Registers  
Figure 4-1 shows the five CPU registers. CPU registers are not part of the memory map.  
7
0
0
0
0
ACCUMULATOR (A)  
15  
15  
15  
H
X
INDEX REGISTER (H:X)  
STACK POINTER (SP)  
PROGRAM COUNTER (PC)  
CONDITION CODE REGISTER (CCR)  
7
0
V
1
1
H
I
N
Z
C
CARRY/BORROW FLAG  
ZERO FLAG  
NEGATIVE FLAG  
INTERRUPT MASK  
HALF-CARRY FLAG  
TWO’S COMPLEMENT OVERFLOW FLAG  
Figure 4-1. CPU Registers  
4.3.1 Accumulator  
The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands  
and the results of arithmetic/logic operations.  
Bit 7  
6
5
4
3
2
1
Bit 0  
Read:  
Write:  
Reset:  
Unaffected by reset  
Figure 4-2. Accumulator (A)  
4.3.2 Index Register  
The 16-bit index register allows indexed addressing of a 64-Kbyte memory space. H is the upper byte of  
the index register, and X is the lower byte. H:X is the concatenated 16-bit index register.  
In the indexed addressing modes, the CPU uses the contents of the index register to determine the  
conditional address of the operand.  
The index register can serve also as a temporary data storage location.  
MC68HC908AP Family Data Sheet, Rev. 4  
56  
Freescale Semiconductor