參數(shù)資料
型號(hào): MC68HC05P18ADWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 60/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ADWE
Central Processor Unit (CPU)
CPU Registers
MC68HC05P18A
Technical Data
Central Processor Unit (CPU)
NON-DISCLOSURE
AGREEMENT
REQUIRED
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
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-2. Accumulator (A)
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-3. Index Register (X)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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