参数资料
型号: M37161MF-XXXSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件页数: 111/129页
文件大小: 1092K
代理商: M37161MF-XXXSP
Rev.1.00
2003.11.25
page 82 of 128
M37161M8/MA/MF-XXXSP/FP,M37161EFSP/FP
Fig.8.11.1 Sequence at Detecting Software Runaway Detection
8.11 SOFTWARE RUNAWAY DETECT FUNCTION
This microcomputer has a function to decode undefined instructions
to detect a software runaway.
When an undefined op-code is input to the CPU as an instruction
code during operation, the following processing is done.
The CPU generates an undefined instruction decoding signal.
The device is internally reset due to the undefined instruction de-
coding signal.
As a result of internal reset, the same reset processing as in the
case of ordinary reset operation is done, and the program restarts
from the reset vector.
Note, however, that the software runaway detecting function cannot
be disalbed.
ADH,
ADL
01,S–2
01,S–1
PCH
PCL
PSADH
ADL
PC
?
: Undefined instruction decode
?
Undefined instruction decoding signal
occurs.Internal reset signal occurs.
φ
SYNC
Address
Data
Reset sequence
01,SFFFE16
FFFF16
: Invalid
: Program counter
S
: Stack pointer
PC
ADL, ADH : Jump destination address of reset
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