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參數(shù)資料
| 型號(hào)： | 7630 |
| 英文描述： | 7630 Group Datasheet Datasheet 840K/JAN.13.99 |
| 中文描述： | 7630組數(shù)據(jù)表數(shù)據(jù)表840K/JAN.13.99 |
| 文件頁數(shù)： | 38/49頁 |
| 文件大?。?/td> | 840K |
| 代理商： | 7630 |
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MITSUBISHI MICROCOMPUTERS
7630 Group
37
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
WATCHDOG TIMER
The watchdog timer consists of two separate counters: one 7-bit
counter (WD
H
) and one 4-bit counter (WD
L
). Cascading both
counters or using the high-order counter allows only to select the
time-out from either 524288 or 32768 cycles of the internal clock
φ
.
Refer to Fig. 41 and Fig. 42. Both counters are addressed by the
same watchdog timer register (WDT). When writing to this register,
both counters will be set to the following default values:
the high-order counter will be set to address 7F
16
the low-order counter will be set to address F
16
regardless of the data written to the WDT register. Reading the
watchdog timer register will return the corresponding control bit sta-
tus, not the counter contents.
Once the WDT register is written to, the watchdog timer starts
counting down and the watchdog timer interrupt is enabled. Once it
is running, the watchdog timer cannot be disabled or stopped
except by reset. On a watchdog timer underflow, a non-maskable
watchdog timer interrupt will be requested.
To prevent the system being stopped by STP instruction, this
instruction can be disabled by the STP instruction disable bit of
WDT register. Once the STP instruction is disabled, it cannot be
enabled again except by RESET.
Fig. 41
Block diagram of watchdog timer
Fig. 42
Structure of watchdog timer register (
φ
is internal clock system)
1/256
φ
WDT interrupt
WD
L
counter (4)
WD
H
counter (7)
WDT
7
“F
16
”
“7F
16
”
WDT register (8)
“0”
“1”
Not used (undefined when read)
Stop instruction disable bit
0 :
Stop instruction enabled
1 :
Execute two NOP instructions instead (once this bit is set to
“1” it can not be cleared to “0” again, except on RESET.)
Upper byte count source selection bit
0 :
Underflow of the low order counter
1 :
φ
divided by 256
7
0
Watchdog timer register (address 002E
16
)
WDT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 76316 | DURABLE MARKING TAPE-B/W |
| 255295 | WARNING TAPE-WITE/RED |
| 255296 | WARNING TAPE-WITE/RED |
| 255297 | WARNING TAPE-WITE/RED |
| 255311 | WARNING TAPE-YELLOWBLACK |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 7630.B | 制造商:GT LINE 功能描述:CASE, EXPLORER |
| 7630_03 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| 76-300 | 制造商:Tenma 功能描述:Enhanced Power Supply Probe Kit 制造商:TENMA 功能描述:ENHANCED POWER SUPPLY PROBE KIT 11 PIECE |
| 763-00/001 | 功能描述:交流電源輸入模塊 DPST SLDR TAB MODULE RoHS:否 制造商:Schurter 過濾:Yes 過濾器類型:IEC Inlet Filters 產(chǎn)品:Inlets 電流額定值:4 A 電壓額定值:250 VAC 外殼材料:Thermoplastic 安裝風(fēng)格:Panel, Screw 端接類型:Quick Connect 工作溫度范圍:- 25 C to + 85 C 連接器類型:C-14 |
| 763-00/002 | 功能描述:交流電源輸入模塊 Screw Mnt Solder RoHS:否 制造商:Schurter 過濾:Yes 過濾器類型:IEC Inlet Filters 產(chǎn)品:Inlets 電流額定值:4 A 電壓額定值:250 VAC 外殼材料:Thermoplastic 安裝風(fēng)格:Panel, Screw 端接類型:Quick Connect 工作溫度范圍:- 25 C to + 85 C 連接器類型:C-14 |
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