D.1.1 CPU32 Register Model
31
16 15
8 7
0
D0
D1
D2
D3
D4
D5
D6
D7
DATA REGISTERS
31
16 15
0
A0
A1
A2
A3
A4
A5
A6
ADDRESS REGISTERS
D
31
31
16 15
0
0
0
A7 (USP) USER STACK POINTER
PC
PROGRAM COUNTER
7
CCR
CONDITION CODE REGISTER
Figure D-1 User Programming Model
31
31
16 15
15
0
0
0
A7 (SSP) SUPERVISOR STACK POINTER
8 7
(CCR)
SR
STATUS REGISTER
VBR
VECTOR BASE REGISTER
2
0
SFC
DFC
ALTERNATE FUNCTION
CODE REGISTERS
Figure D-2 Supervisor Programming Model Supplement
MOTOROLA
D-2
REGISTER SUMMARY
MC68331
USER’S MANUAL