參數(shù)資料
型號(hào): MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 38/158頁
文件大小: 773K
代理商: MC68HC05C8A
Central Processor Unit (CPU)
Technical Data
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
38
Central Processor Unit (CPU)
MOTOROLA
Figure 3-1. Programming Model
Figure 3-2. Stacking Order
3.3.1 Accumulator
The accumulator (A) shown in
Figure 3-1
is a general-purpose 8-bit
register used to hold operands and results of arithmetic calculations or
data manipulations.
3.3.2 Index Register
The index register (X) is an 8-bit register used by the indexed addressing
value to create an effective address. The index register also may be
used as a temporary storage area.
A
7
0
X
7
0
H
I
N
Z
C
CCR
1
1
SP
7
0
PC
12
0
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER
STACK POINTER
CONDITION CODE REGISTER
0
0
0
0
0
12
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.
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