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)： 22/145頁
文件大小： 829K
代理商： EC000UM
8-Bit Instruction Execution Times
MOTOROLA
EC000 CORE PROCESSOR USER’S MANUAL
5-9
5.12 EXCEPTION PROCESSING EXECUTION TIMES
Table 5-15 lists the timing data for exception processing. The numbers of clock periods
include the times for all stacking, the vector fetch, and the fetch of the first instruction of the
handler routine. The total number of clock periods, the number of read cycles, and the num-
ber of write cycles are shown in the previously described format. The number of clock peri-
ods, the number of read cycles, and the number of write cycles, respectively, must be added
to those of the effective address calculation where indicated by a plus sign (+).
Table 5-14. Move Peripheral Instruction Execution Times
Instruction
Size
Register
→ Memory
Memory
→ Register
MOVEP
Word
Long
24(4/2)
32(4/4)
24(6/0)
32(8/0)
+ Add effective address calculation time.
Table 5-15. Exception Processing Execution Times
Exception
Periods
Address Error
94(8/14)
Bus Error
94(8/14)
CHK Instruction
68(8/6)+
Divide-by-Zero
66(8/6)+
Interrupt
72(9/6)*
Illegal Instruction
62(8/6)
Privilege Violation
62(8/6)
RESET**
64(12/0)
Trace
62(8/6)
TRAP Instruction
62(8/6)
TRAPV Instruction
66(10/6)
+Add effective address calculation time.
*The interrupt acknowledge cycle is assumed to take four
clock periods.
**Indicates the time from when RESET and HALT are rst
sampled as negated to when instruction execution starts.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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