參數(shù)資料
型號: MC68CK338CPV14B1
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝: TQFP-144
文件頁數(shù): 80/133頁
文件大?。?/td> 817K
代理商: MC68CK338CPV14B1
MOTOROLA
MC68CK338
50
MC68CK338TS/D
Figure 13 Supervisor Programming Model Supplement
4.3 Status Register
The status register contains the condition codes that reflect the results of a previous operation and can
be used for conditional instruction execution in a program. The lower byte containing the condition
codes is the only portion of the register available at the user privilege level; it is referenced as the con-
dition code register (CCR) in user programs. At the supervisor privilege level, software can access the
full status register, including the interrupt priority mask and additional control bits.
System Byte
T[1:0] — Trace Enable
S — Supervisor/User State
Bits [12:11] — Unimplemented
IP[2:0] — Interrupt Priority Mask
User Byte (Condition Code Register)
Bits [7:5] — Unimplemented
X — Extend
N — Negative
Z — Zero
V — Overflow
C — Carry
SR — Status Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
T1
T0
S
0
IP
0
X
N
Z
V
C
RESET:
0
1
0
1
0
U
16
31
15
0
15
0
87
(CCR)
31
0
2
A7’ (SSP)
SR
VBR
SFC
DFC
SUPERVISOR STACK POINTER
STATUS REGISTER
VECTOR BASE REGISTER
ALTERNATE FUNCTION
CODE REGISTERS
CPU32 SUPV PROG MODEL
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