BIT DATA
1 BYTE = 8 BITS
7
6
5
4
3
2
1
0
INTEGER DATA
1 BYTE = 8 BITS
15
MSB
8
7
0
0
BYTE 0
BYTE 2
LSB
BYTE 1
BYTE 3
WORD = 16 BITS
15
MSB
WORD 0
WORD 1
WORD 2
LSB
LONG WORD = 32 BITS
15
MSB
0
5
HIGH ORDER
LOW ORDER
LONG WORD 0
LSB
LONG WORD 1
LONG WORD 2
ADDRESS 1
ADDRESS = 32 BITS
15
MSB
0
HIGH ORDER
LOW ORDER
ADDRESS 0
ADDRESS 1
ADDRESS 2
LSB
MSB = Most Significant Bit
LSB = Least Significant Bit
DECIMAL DATA
BCD DIGITS = 1 BYTE
8 7
15
12 11
MSD
4 3
0
BCD 0
BCD 4
BCD 1
BCD 5
LSD
BCD 2
BCD 6
BCD 3
BCD 7
MSD = Most Significant Digit
LSD = Least Significant Digit
1125A
Figure 5-6 Memory Operand Addressing
MOTOROLA
5-8
CENTRAL PROCESSING UNIT
MC68331
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
