參數(shù)資料
型號： M37534E4GP
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機
文件頁數(shù)： 33/55頁
文件大?。?/td> 610K
代理商： M37534E4GP
7534 Group
Rev.2.00 Jun 21, 2004 page 33 of 54
REJ03B0099-0200Z
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 register
(address 0039
16
) is not set after reset. Writing an optional value to
the watchdog timer control register (address 0039
16
) causes the
watchdog timer to start to count down. When the watchdog timer H
underflows, an internal reset occurs. Accordingly, it is programmed
that the watchdog timer control register (address 0039
16
) can be set
before an underflow occurs.
When the watchdog timer control register (address 0039
16
) is read,
the values of the high-order 6-bit of the watchdog timer H, STP in-
struction disable bit and watchdog timer H count source selection bit
are read.
Initial value of watchdog timer
By a reset or writing to the watchdog timer control register (address
0039
16
), the watchdog timer H is set to “FF
16
” and the watchdog
timer L is set to “FF
16
”.
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 0039
16
). When this bit is
“0”, the count source becomes a watchdog timer L underflow signal.
The detection time is 174.763 ms at f(X
IN
)=6 MHz.
When this bit is “1”, the count source becomes f(X
IN
)/16. In this
case, the detection time is 683 μs at f(X
IN
)=6 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 (address
0039
16
).
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, and an internal
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. 38 Block diagram of watchdog timer
Fig. 39 Structure of watchdog timer control register
X
IN
Data bus
“0”
“1”
Watchdog timer H count
source selection bit
1/16
Reset
circuit
STP Instruction Disable Bit
STP Instruction
Watchdog timer H (8)
Write “FF
16
” to the
watchdog timer
control register
Internal reset
RESET
Watchdog timer L (8)
Write “FF
16
” to the
watchdog timer
control register
Watchdog timer control register(address 0039
16
)
WDTCON
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(X
IN
)/16
b7 b0
相關PDF資料
PDF描述
M37534E4FP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37544 SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37548G1FP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37549G1FP 32K x 8 Static RAM; Density: 256 Kb; Organization: 32Kb x 8; Vcc (V): 4.5 to 5.5 V;
M38030F2L-XXXWG SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
相關代理商/技術參數(shù)
參數(shù)描述
M37534E4GP#U1 功能描述:MCU 4/5V 8K PB-FREE 32-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓模塊:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 標準包裝:1 系列:M16C™ M32C/80/87 核心處理器:M32C/80 芯體尺寸:16/32-位 速度:32MHz 連通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外圍設備:DMA，POR，PWM，WDT 輸入/輸出數(shù):121 程序存儲器容量:384KB（384K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:24K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 34x10b，D/A 2x8b 振蕩器型:內(nèi)部 工作溫度:-20°C ~ 85°C 封裝/外殼:144-LQFP 包裝:托盤 產(chǎn)品目錄頁面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87
M37534E8FP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37534E8SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37534M4 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37534M4-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*