參數(shù)資料
型號(hào): M37225MC-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封裝: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁數(shù): 115/128頁
文件大?。?/td> 1481K
代理商: M37225MC-XXXSP
M37225M6/M8/MA/MC-XXXSP, M37225ECSP
Rev.1.00
Nov 01, 2000
page 85 of 124
REJ03B0136-0100Z
ADH,
ADL
01,S–2
01,S–1
PCH
PCL
PS
ADH
ADL
PC
?
: Undefined instruction decode
?
Undefined instruction decoding signal
occurs.Internal reset signal occurs.
φ
SYNC
Address
Data
Reset sequence
01,S
FFFE16
FFFF16
: Invalid
: Program counter
S
: Stack pointer
PC
ADL, ADH : Jump destination address of reset
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 because of occurrence of the unde-
fined instruction decoding 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 invalid.
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