參數(shù)資料
型號(hào): MC68HSC05J1A
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 35/128頁
文件大小: 1620K
代理商: MC68HSC05J1A
Central Processor Unit (CPU)
CPU Registers
MC68HC05J1A — Rev. 3.0
Technical Data
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
35
3.3.1 Accumulator
The accumulator (A) shown in
Figure 3-2
is a general-purpose 8-bit
register. The CPU uses the accumulator to hold operands and results of
arithmetic and non-arithmetic operations.
Figure 3-2. Accumulator (A)
3.3.2 Index Register
In the indexed addressing modes, the CPU uses the byte in the index
register (X) shown in
Figure 3-3
to determine the conditional address of
the operand. See
9.3.5 Indexed, No Offset
,
9.3.6 Indexed, 8-Bit
Offset
, and
9.3.7 Indexed, 16-Bit Offset
for more information on
indexed addressing.
The 8-bit index register also can serve as a temporary data storage
location.
Figure 3-3. Index Register (X)
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
F
Freescale Semiconductor, Inc.
n
.
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