參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 35/130頁
文件大小: 1200K
代理商: MC68HC05P18A
Central Processor Unit (CPU)
CPU Registers
MC68HC05P18A
Technical Data
MOTOROLA
Central Processor Unit (CPU)
35
L
G
R
3.3.1 Accumulator
The accumulator (A) is a general-purpose 8-bit register. The CPU uses
the accumulator to hold operands and results of arithmetic and non-
arithmetic operations.
3.3.2 Index Register
In the indexed addressing modes, the CPU uses the byte in the index
register (X) to determine the conditional address of the operand.
The 8-bit index register can also serve as a temporary data storage
location.
3.3.3 Stack Pointer
The stack pointer (SP) is a 16-bit register that contains the address of
the next location on the stack. During a reset or after the reset stack
pointer (RSP) instruction, the stack pointer is preset to $00FF. The
address in the stack pointer decrements as data is pushed onto the
stack and increments as data is pulled from the stack.
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-2. Accumulator (A)
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-3. Index Register (X)
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