參數(shù)資料
型號： EC000UM
英文描述： EC000 Core User＇s Manual (SCM68000)
中文描述： EC000核心用戶手冊（SCM68000）
文件頁數(shù)： 59/145頁
文件大小： 829K
代理商： EC000UM
Overview
MOTOROLA
EC000 CORE PROCESSOR USER’S MANUAL
1-7
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).
Figure 1-3. Programming Model
31
16 15
8 7
0
31
16 15
0
D0
D1
D2
D3
D4
D5
D6
D7
A1
A2
A3
A4
A5
A6
A0
A7
(USP) POINTER
PC
CCR
CONDITION CODE
REGISTER
PROGRAM
COUNTER
USER STACK
SEVEN
ADDRESS
REGISTERS
EIGHT
DATA
REGISTERS
31
70
0
(a) USER PROGRAMMING MODEL
(b) SUPERVISOR PROGRAMMING MODEL
SUPERVISOR STACK
POINTER
31
16 15
0
15
8 7
0
STATUS REGISTER
A7'
(SSP)
SR
CCR
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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