M68HC11F1EVS データシートの表示（PDF） - Freescale Semiconductor

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M68HC11F1EVS

MC68HC11F1 high-performance microcontroller unit (MCU)

Freescale Semiconductor 

Freescale Semiconductor, Inc.

7

0

ACCUMULATOR A

A

7

0

ACCUMULATOR B

B

15

0

DOUBLE ACCUMULATOR D

D

15

0

INDEX REGISTER X

IX

15

0

INDEX REGISTER Y

IY

15

0

STACK POINTER

SP

15

0

PROGRAM COUNTER

PC

7 65432 10

CONDITION CODE REGISTER S X H I N Z V C CCR

CARRY

OVERFLOW

ZERO

NEGATIVE

I INTERRUPT MASK

HALF-CARRY (FROM BIT 3)

X INTERRUPT MASK

STOP DISABLE

Figure 3-1 Programming Model

3.1.1 Accumulators A, B, and D

Accumulators A and B are general-purpose 8-bit registers that hold operands and re-

sults of arithmetic calculations or data manipulations. For some instructions, these two

accumulators are treated as a single double-byte (16-bit) accumulator called accumu-

lator D. Although most instructions can use accumulators A or B interchangeably, the

following 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.

The decimal adjust accumulator A (DAA) instruction is used after binary-coded deci-

mal (BCD) arithmetic operations, but there is no equivalent BCD instruction to adjust

accumulator B.

CENTRAL PROCESSING UNIT

MC68HC11F1

3-2

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