參數(shù)資料
型號: M68HC05M68H
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 96/130頁
文件大?。?/td> 1541K
代理商: M68HC05M68H
Central Processor Unit (CPU) Core
Advance Information
MC68HC705P6A
Rev. 2.0
96
Central Processor Unit (CPU) Core
MOTOROLA
Figure 12-1. MC68HC05 Programming Model
12.3.1 Accumulator
The accumulator is a general-purpose 8-bit register as shown in
Figure
12-1
. The CPU uses the accumulator to hold operands and results of
arithmetic calculations or non-arithmetic operations. The accumulator is
unaffected by a reset of the device.
12.3.2 Index Register
The index register shown in
Figure 12-1
is an 8-bit register that can
perform two functions:
Indexed addressing
Temporary storage
In indexed addressing with no offset, the index register contains the low
byte of the operand address, and the high byte is assumed to be $00. In
indexed addressing with an 8-bit offset, the CPU finds the operand
address by adding the index register contents to an 8-bit immediate
value. In indexed addressing with a 16-bit offset, the CPU finds the
CONDITION CODE REGISTER
I
ACCUMULATOR
6
0
A
INDEX REGISTER
7
1
X
4
5
2
3
STACK POINTER
SP
14
8
15
9
12
13
10
11
PC
CC
1
1
1
1
1
0
0
0
0
0
0
0
0
PROGRAM COUNTER
H
N
Z
C
HALF-CARRY BIT (FROM BIT 3)
INTERRUPT MASK
NEGATIVE BIT
ZERO BIT
CARRY BIT
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