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7220 bảng dữ liệu(PDF) 117 Page - Renesas Technology Corp

tên linh kiện 7220
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  303 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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7220 bảng dữ liệu(HTML) 117 Page - Renesas Technology Corp

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7220 Group User’s Manual
FUNCTIONAL DESCRIPTION
2.13 Software runaway detect function
Fig. 2.13.1 Sequence at detecting software runaway detection
2.13 Software runaway detect function
The M37221M6-XXXSP/FP 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 of the M37221M6-
XXXSP/FP, the following processing is done.
ΠThe CPU generates an undefined instruction decoding signal.
 The device is internally reset because of occurrence of the undefined instruction decoding signal.
Ž 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.
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



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