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參數資料
| 型號： | M37544G2GP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁數： | 28/70頁 |
| 文件大?。?/td> | 645K |
| 代理商： | M37544G2GP |
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7544 Group
Rev.1.04
2004.06.08
page 32 of 66
REJ03B0012-0104Z
Watchdog Timer
The watchdog timer gives a means for returning to a reset status
when the program fails to run on its normal loop due to a runaway.
The watchdog timer consists of an 8-bit watchdog timer H and an
8-bit watchdog timer L, being a 16-bit counter.
Standard operation of watchdog timer
The watchdog timer stops when the watchdog timer control regis-
ter (address 003916) is not set after reset. Writing an optional
value to the watchdog timer control register (address 003916)
causes the watchdog timer to start to count down. When the
watchdog timer H underflows, an internal reset occurs. Accord-
ingly, it is programmed that the watchdog timer control register
(address 003916) can be set before an underflow occurs.
When the watchdog timer control register (address 003916) is
read, the values of the high-order 6-bit of the watchdog timer H,
STP instruction disable bit and watchdog timer H count source se-
lection bit are read.
Initial value of watchdog timer
By a reset or writing to the watchdog timer control register (ad-
dress 003916), the watchdog timer H is set to “FF16” and the
watchdog timer L is set to “FF16”.
Operation of watchdog timer H count source selection bit
A watchdog timer H count source can be selected by bit 7 of the
watchdog timer control register (address 003916). When this bit is
“0”, the count source becomes a watchdog timer L underflow sig-
nal. The detection time is 131.072 ms at f(XIN)=8 MHz.
When this bit is “1”, the count source becomes f(XIN)/16. In this
case, the detection time is 512
s at f(XIN)=8 MHz.
This bit is cleared to “0” after reset.
Operation of STP instruction disable bit
When the watchdog timer is in operation, the STP instruction can
be disabled by bit 6 of the watchdog timer control register (ad-
dress 003916).
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, and an inter-
nal reset occurs if the STP instruction is executed.
Once this bit is set to “1”, it cannot be changed to “0” by program.
This bit is cleared to “0” after reset.
Fig. 35 Block diagram of watchdog timer
Fig. 36 Structure of watchdog timer control register
XIN
Data bus
“0”
“1”
1/16
Watchdog timer H count
source selection bit
Reset
circuit
STP Instruction disable bit
Watchdog timer H (8)
Write "FF16" to the
watchdog timer
control register
Internal
reset
RESET
Watchdog timer L (8)
STP Instruction
Write “FF16” to the
watchdog timer
control register
Watchdog timer control register
(WDTCON: address 003916, initial value: 3F16)
Watchdog timer H (read only for high-order 6-bit)
STP instruction disable bit
0 : STP instruction enabled
1 : STP instruction disabled
Watchdog timer H count source selection bit
0 : Watchdog timer L underflow
1 : f(XIN)/16
b7
b0
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PDF描述 |
|---|---|
| M37544G2SP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37545G2KP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO32 |
| M37545G8-XXXGP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
| M37545GC-XXXGP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| M37544G2HP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37544G2SP | 功能描述:IC 740 MCU OTP 8K 32P4B RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標準包裝:330 系列:- 核心處理器:- 芯體尺寸:8/16-位 速度:40MHz 連通性:UART/USART 外圍設備:DMA，PWM，WDT 輸入/輸出數:32 程序存儲器容量:- 程序存儲器類型:外部程序存儲器 EEPROM 大小:- RAM 容量:- 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:100-BQFP 包裝:管件 |
| M37544M2-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37544M2-XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37544M2-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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