參數(shù)資料
型號(hào)： M306H7MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù)： 73/115頁
文件大?。?/td> 3146K
代理商： M306H7MC-XXXFP
Rev.2.10
Oct 25, 2006
Page 60 of 326
REJ03B0152-0210
M306H7MG-XXXFP/MC-XXXFP/FGFP
7. WATCHDOG TIMER
7.
Watchdog Timer
The watchdog timer is the function of detecting when the program is out of control. Therefore, we recommend using
the watchdog timer to improve reliability of a system. The watchdog timer contains a 15-bit counter which counts
down the clock derived by dividing the CPU clock using the prescaler. Whether to generate a watchdog timer interrupt
request or apply a watchdog timer reset as an operation to be performed when the watchdog timer underflows after
reaching the terminal count can be selected using the PM12 bit of PM1 register. The PM12 bit can only be set to “1”
(reset). Once this bit is set to “1”, it cannot be set to “0” (watchdog timer interrupt) in a program.
Refer to “Watchdog Timer Reset” for the details of watchdog timer reset.
When the main clock is selected for CPU clock, the divide-by-N value for the prescaler can be chosen to be 16 or 128
using the WDC7 bit of WDC register. If a sub-clock is selected for CPU clock, the divide-by- N value for the prescaler
is always 2 no matter how the WDC7 bit is set. The period of watchdog timer can be calculated as given below. The
period of watchdog timer is, however, subject to an error due to the prescaler.
With main clock chosen for CPU clock
Watchdog timer period = Prescaler dividing (16 or 128) X Watchdog timer count (32768)
CPU clock
With sub-clock chosen for CPU clock
Watchdog timer period = Prescaler dividing (2) X Watchdog timer count (32768)
CPU clock
For example, when CPU clock = 10 MHz and the divide-by-N value for the prescaler= 16, the watchdog timer period
is approx. 52.4 ms.
The watchdog timer is initialized by writing to the WDTS register. The prescaler is initialized after reset.
Note that the watchdog timer and the prescaler both are inactive after reset, so that the watchdog timer is activated to
start counting by writing to the WDTS register.
In stop mode, wait mode and hold state, the watchdog timer and prescaler are stopped. Counting is resumed from the
held value when the modes or state are released.
Figure 7.1 shows the block diagram of the watchdog timer. Figure 7.2 shows the watchdog timer-related registers.
相關(guān)PDF資料
PDF描述
M306NMFHTGP 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP128
M306NMFJVGP 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP128
M306NKFJVGP 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
M306NKFHVGP 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
M306NKFJTGP 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M306H7MG-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER
M306K7F8LRP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M306K9FCLRP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M306K9T2-CPE 功能描述:M-SUPPORT TOOL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 內(nèi)電路編程器、仿真器以及調(diào)試器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 19/Jul/2010 標(biāo)準(zhǔn)包裝:1 系列:* 類型:* 適用于相關(guān)產(chǎn)品:* 所含物品:*
M306KAFCLRP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*