參數資料
型號: HC805P18GRS
英文描述: 68HC805P18 Technical Data
中文描述: 68HC805P18技術數據
文件頁數: 25/111頁
文件大?。?/td> 748K
代理商: HC805P18GRS
GENERAL RELEASE SPECIFICATION
MOTOROLA
3-2
CENTRAL PROCESSING UNIT
MC68HC805P18
Rev. 1.0
8
2
3
4
5
6
7
8
9
10
11
12
13
14
A
16
17
18
19
20
Figure 3-2. Stacking Order
3.2.1 Accumulator (A)
The accumulator is a general-purpose 8-bit register used to hold operands and
results of arithmetic calculations or data manipulations.
3.2.2 Index Register (X)
The index register is an 8-bit register used for the indexed addressing value to
create an effective address. The index register may also be used as a temporary
storage area.
INDEX REGISTER
PCL
ACCUMULATOR
CONDITION CODE REGISTER
PCH
1
1
1
7
0
STACK
I
N
T
E
R
R
U
P
T
DECREASING
MEMORY
ADDRESSES
UNSTACK
R
E
T
U
R
N
INCREASING
MEMORY
ADDRESSES
NOTE: Since the stack pointer decrements during pushes, the PCL is stacked first,
followed by PCH, etc. Pulling from the stack is in the reverse order.
A
7
0
X
7
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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