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MOTOROLA M68040 USER’S MANUAL A- 3
With the exception of the floating-point unit (FPU) and its registers, the MC68LC040
programming model, data formats and types, instruction set (except all instructions
beginning with an “F”), caches, and MMUs are the same as those described in Section 1
Introduction for the MC68040. Figures A-2 and A-3 illustrate the programming model and
functional signal groups for the MC68LC040.
31 0
A7'/ISP
A7"/MSP
SR
VBR
SFC
DFC
CACR
URP
SRP
TC
DTT0
DTT1
ITT0
ITT1
MMUSR
(CCR)
INTERRUPT STACK POINTER
MASTER STACK POINTER
STATUS REGISTER
VECTOR BASE REGISTER
SOURCE FUNCTION CODE
DESTINATION FUNCTION CODE
CACHE CONTROL REGISTER
USER ROOT POINTER REGISTER
SUPERVISOR ROOT POINTER REGISTER
TRANSLATION CONTROL REGISTER
DATA TRANSPARENT TRANSLATION REGISTER 0
DATA TRANSPARENT TRANSLATION REGISTER 1
INSTRUCTION TRANSPARENT TRANSLATION REGISTER 0
INSTRUCTION TRANSPARENT TRANSLATION REGISTER 1
MMU STATUS REGISTER
SUPERVISOR PROGRAMMING MODEL
USER PROGRAMMING MODEL
CCR
PC
A7/USP
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
31 0
DATA
REGISTERS
ADDRESS
REGISTERS
PROGRAM COUNTER
CONDITION CODE REGISTER
USER STACK POINTER
Figure A-2. MC68LC040 Programming Model
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