Datasheet

Chapter 2. ColdFire Core 2-27
Programming Model
Figure 2-3. ColdFire Programming Model
2.2.1 User Programming Model
As Figure 2-3 shows, the user programming model consists of the following registers:
• 16 general-purpose 32-bit registers, D0–D7 and A0–A7
• 32-bit program counter
• 8-bit condition code register
2.2.1.1 Data Registers (D0–D7)
Registers D0–D7 are used as data registers for bit, byte (8-bit), word (16-bit), and longword
(32-bit) operations. They may also be used as index registers.
2.2.1.2 Address Registers (A0–A6)
The address registers (A0–A6) can be used as software stack pointers, index registers, or
base address registers and may be used for word and longword operations.
31 0
D0 Data registers
D1
D2
D3
D4
D5
D6
D7
31 0
A0 Address registers
A1
A2
A3
A4
A5
A6
A7 Stack pointer
PC Program counter
CCR Condition code register
31 0
MACSR MAC status register
ACC MAC accumulator
MASK MAC mask register
15
31 19
(CCR) SR Status register
Must be zeros VBR Vector base register
CACR Cache control register
ACR0 Access control register 0
ACR1 Access control register 1
RAMBAR RAM base address register
MBAR Module base address register
User Registers
Supervisor Registers
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