- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69016 > M38C37ECAXXXFP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 PDF資料下載
參數(shù)資料
| 型號(hào)： | M38C37ECAXXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 129/221頁 |
| 文件大?。?/td> | 1919K |
| 代理商： | M38C37ECAXXXFP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁當(dāng)前第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁
11-4
MC68VZ328 User’s Manual
RTC Overview
11.1.4 Watchdog Timer
The watchdog timer is an added check that a program is running and sequencing properly. When the
application software is running, it is responsible for keeping the 2-second watchdog timer from timing out.
If the watchdog timer times out, it is an indication that the software is no longer being executed in the
intended sequence. At this time the watchdog timer generates either an interrupt or a reset signal to the
system.
Programming the watchdog timer (WATCHDOG) register determines if the 2-second rollover produces a
watchdog interrupt or a system reset. At reset, the watchdog timer is enabled and generates a system reset.
The watchdog timer is clocked by the 1 Hz clock from the prescaler and therefore has 1-second resolution.
It is recommended that the watchdog timer be periodically cleared by software once it is enabled.
Otherwise, either a software reset or watchdog interrupt will be generated when the timer reaches a binary
value of 10. The timer can be reset by writing any value into it.
11.1.5 Real-Time Interrupt Timer
There is a real-time interrupt available to the user. This interrupt will occur at one of eight different
selected rates. Applications for the real-time interrupt can include digitizer sampling, keyboard
debouncing, or communication polling.
Each of the eight real-time interrupts operates at a fixed frequency. The frequencies of the real-time
interrupts are shown in Table 11-9 on page 11-12. Bits RTE0–RTE7 in the RTC interrupt enable register
(RTCIENR) enable each of the eight different predefined rates. When the real-time interrupt occurs, it
applies a level 4 interrupt to the MC68VZ328 interrupt controller. The real-time clock (RTCEN bit in the
RTCCTL) or the watchdog timer (EN bit in the watchdog register) must be enabled for the real-time
interrupt timer to operate. If the RTC and watchdog timer are disabled, the real-time interrupt stops.
11.1.6 Minute Stopwatch
When enabled, the minute stopwatch performs a countdown that has a 1-minute resolution. The minute
stopwatch counts down and remains at decimal -1 until it is reprogrammed. The minute stopwatch can be
used to generate an interrupt after a certain number of minutes have elapsed. If the SW bit in the RTCIENR
register is enabled with -1 (decimal) in the STPWCH register, an interrupt will be posted on the next
minute tick.
11.1.6.1 Minute Stopwatch Application Example
The minute stopwatch can be used to turn off the LCD controller after 5 minutes of inactivity. To
accomplish this, the minute stopwatch is programmed with a value of 5 minutes, and then the stopwatch
interrupt (SW bit) in the RTCIENR is enabled. At consecutive minute increments, the minute stopwatch
value is decremented. An SW interrupt is generated when the counter counts to -1. The stopwatch interrupt
(SW bit) in the RTCISR occurs after 5 minutes. In addition to the 5 minutes of the stopwatch, there is an
unknown number of seconds from the time the stopwatch is set until the first minute.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M38D59TFFP | 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP80 |
| M38K07M4L-XXXFP | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP64 |
| M38K07M4L-XXXHP | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP64 |
| M38K09F8LHP | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP64 |
| M38K09F8LFP | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M38C59GFHP#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 2/4V 60K PB-FREE - Trays |
| M38D20F1XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D20F1XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D20F2XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D20F2XXXHP | 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(fù)。