68000 データシートの表示（PDF） - Freescale Semiconductor

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68000

8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor 

Freescale Semiconductor, Inc.

BIT DATA

1 BYTE = 8 BITS

76 543210

INTEGER DATA

1 BYTE = 8 BITS

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MSB

BYTE 0

LSB

BYTE 1

BYTE 2

BYTE 3

1 WORD = 16 BITS

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MSB

WORD 0

LSB

WORD 1

WORD 2

EVEN BYTE

ODD BYTE

76

54 3 2 1 0 7 6

54 3 2

1 LONG WORD = 32 BITS

15 14 13 12 11 10 9 8 7 6 5 4 3 2

MSB

LONG WORD 0

HIGH ORDER

LOW ORDER

10

10

LSB

LONG WORD 1

LONG WORD 2

ADDRESSES

1 ADDRESS = 32 BITS

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MSB

HIGH ORDER

ADDRESS 0

LOW ORDER

LSB

ADDRESS 1

ADDRESS 2

MSB = MOST SIGNIFICANT BIT

LSB = LEAST SIGNIFICANT BIT

DECIMAL DATA

2 BINARY-CODED-DECIMAL DIGITS = 1 BYTE

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MSD

BCD 0

BCD 1 LSD

BCD 2

BCD 3

BCD 4

BCD 5

BCD 6

BCD 7

MSD = MOST SIGNIFICANT DIGIT

LSD = LEAST SIGNIFICANT DIGIT

Figure 2-6. Data Organization in Memory

MOTOROLA

M68000 8-/16-/32-BIT MICROPROCESSOR USER’S MANUAL

2-7

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