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參數(shù)資料
| 型號： | M34571G4 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機的CMOS |
| 文件頁數(shù)： | 62/126頁 |
| 文件大?。?/td> | 1627K |
| 代理商： | M34571G4 |
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Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 62 of 124
4571 Group
<The main routine>
Assigns a single word of RAM to a software watchdog timer
(SWDT) and writes the initial value N in the SWDT once at
each execution of the main routine. The initial value N should
satisfy the following condition:
N+1
≥
(Counts of interrupt processing executed in each main
routine)
As the main routine execution cycle may change because of an
interrupt processing or others, the initial value N should have a
margin.
Watches the operation of the interrupt processing routine by
comparing the SWDT contents with counts of interrupt
processing after the initial value N has been set.
Detects that the interrupt processing routine has failed and
deter-mines to branch to the program initialization routine for
recovery processing in the following case:
If the SWDT contents do not change after interrupt processing.
<The interrupt processing routine>
Decrements the SWDT contents by 1 at each interrupt processing.
Determines that the main routine operates normally when the
SWDT contents are reset to the initial value N at almost fixed
cycles (at the fixed interrupt processing count).
Detects that the main routine has failed and determines to
branch to the program initialization routine for recovery
processing in the following case:
If the SWDT contents are not initialized to the initial value N
but continued to decrement and if they reach 0 or less.
Fig 70. Watchdog timer by software
≠
N
N
>0
≤
0
Main routine
(SWDT)
←
N
EI
Main processing
(SWDT)
=N
Interrupt processing
routine errors
Interrupt processing routine
(SWDT)
←
(SWDT)
1
Interrupt processing
(SWDT)
≤
0
RTI
Return
Main routine
errors
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34571G4FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34571G4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34571G6 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34571G6FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34571G6-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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