MC68030 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

View to exact match

MC68030

ENHANCED 32-BIT MICROPROCESSOR

Motorola => Freescale 

Data Organization and Addressing Capabilities

The data types supported in memory by the MC68030 are bit and bit field data; integer data

of 8, 16, or 32 bits; 32-bit addresses; and BCD data (packed and unpacked). These data

types are organized in memory as shown in Figure 2–2. Note that all of these data types can

be accessed at any byte address.

Coprocessors can implement any data types and lengths up to 255 bytes. For example, the

MC68881/MC68882 floating-point coprocessors support memory accesses for quad-word-

sized items (double-precision floating-point values).

Figure 2A bit operand is specified by a base address that selects one byte in memory (the

base byte) and a bit number that selects the one bit in this byte. The most significant bit of

the byte is bit 7.

31

23

15

7

0

LONG WORD $00000000

WORD $00000000

WORD $00000002

BYTE $00000000

BYTE $00000001

BYTE $00000002

LONG WORD $00000004

BYTE $00000003

WORD $00000004

WORD $00000006

BYTE $00000004

BYTE $00000005

BYTE $00000006

BYTE $00000007

LONG WORD $FFFFFFFC

WORD $FFFFFFFC

WORD $FFFFFFFE

BYTE $FFFFFFFC

BYTE $FFFFFFFD

BYTE $FFFFFFFE

BYTE $FFFFFFFF

Figure 2-1. Memory Operand Address

2-6

MC68030 USER’S MANUAL

MOTOROLA

Share Link: