參數(shù)資料
型號(hào): MC68HC11ED0MFN2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 27/108頁
文件大?。?/td> 1672K
代理商: MC68HC11ED0MFN2
Central Processor Unit (CPU)
CPU Registers
MC68HC11ED0 — Rev. 1.0
Technical Summary
Central Processor Unit (CPU)
Figure 3-1. Programming Model
3.3.1 Accumulators A, B, and D
Accumulators A and B are general-purpose 8-bit registers that hold
operands and results of arithmetic calculations or data manipulations.
For some instructions, these two accumulators are treated as a single
double-byte (16-bit) accumulator called accumulator D. Although most
instructions can use accumulators A or B interchangeably, these
exceptions apply:
The ABX and ABY instructions add the contents of 8-bit
accumulator B to the contents of 16-bit register X or Y, but there
are no equivalent instructions that use A instead of B.
The TAP and TPA instructions transfer data from accumulator A
to the condition code register or from the condition code register
to accumulator A. However, there are no equivalent instructions
that use B rather than A.
8-BIT ACCUMULATORS A & B
70
15
0
AB
D
IX
IY
SP
PC
70
C
V
Z
N
I
H
X
S
OR 16-BIT DOUBLE ACCUMULATOR D
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
PROGRAM COUNTER
CARRY/BORROW FROM MSB
OVERFLOW
ZERO
NEGATIVE
I-INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X-INTERRUPT MASK
STOP DISABLE
CONDITION CODES
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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