MC68EC000 Motorola, MC68EC000 Datasheet - Page 20

• Manufacturer Part Number: MC68EC000
• Description: Core Processor (SCM 68000)
• Manufacturer: Motorola

1.3 PROGRAMMING MODEL
The SCM68000 programming model is illustrated in Figure 1-3. It is separated into two
modes of access: user and supervisor. The user mode provides the execution environment
for the majority of application programs. The supervisor mode, which allows some additional
instructions and privileges, is used by the operating system and other system software.
Detailed information about the programming model can be found in the M68000 Family Pro-
grammer's Reference Manual (M68000PM/AD).
MOTOROLA
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Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
For More Information On This Product,
Figure 1-3. Programming Model
Go to: www.freescale.com
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(b) SUPERVISOR PROGRAMMING MODEL
16 15
16 15
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(a) USER PROGRAMMING MODEL
8 7
8 7
7
CCR
0
0
0
0
0
0
A7'
(SSP)
SR
CCR
D0
D1
D2
D3
D4
D5
D6
D7
(USP) POINTER
A0
A1
A2
A3
A4
A5
A6
A7
PC
SUPERVISOR STACK
POINTER
STATUS REGISTER
EIGHT
DATA
REGISTERS
SEVEN
ADDRESS
REGISTERS
USER STACK
PROGRAM
COUNTER
CONDITION CODE
REGISTER
Overview
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