參數(shù)資料
型號: MC68HC05P9AVDW
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): 84/158頁
文件大?。?/td> 3885K
代理商: MC68HC05P9AVDW
CPU
CPU Registers
CPU
Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic and logic
operations.
Index Register
The index register can be used for data storage or as a counter. In the
indexed addressing modes, the CPU uses the byte in the index register
to determine the effective address of the operand.
Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next
stack location to be used. During a reset or after the reset stack pointer
instruction (RSP), the stack pointer is preset to $00FF. The address in
the stack pointer decrements after a byte is stacked and increments
before a byte is unstacked.
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 12. Accumulator (A)
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 13. Index Register (X)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
0
1
Write:
Reset:
0
1
= Unimplemented
Figure 14. Stack Pointer (SP)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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