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參數(shù)資料
| 型號(hào)： | MC68328PV |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP144 |
| 封裝： | PLASTIC, TQFP-144 |
| 文件頁(yè)數(shù)： | 15/198頁(yè) |
| 文件大?。?/td> | 551K |
| 代理商： | MC68328PV |
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Real-Time Clock
9-2
MC68328 USER’S MANUAL 12/9/97
MOTOROLA
REAL-TIME
CLOCK
9
PRELIMINARY
9.2 OPERATION
9.2.1 Prescaler and Counter
The prescaler divides the 32.768kHz reference clock down to 1 pulse per second. An
alternate reference frequency of 38.4kHz is also supported. The real-time clock
hours/minutes/seconds (RTCHMS) register consists of three groups of bits that track the
current time in hours, minutes, and seconds in a 24-hour format. The seconds and minutes
counters are 6 bits long and the hours counter is 5 bits long. The prescaler stages are
tapped to support several features. Periodic interrupts at 1Hz (or 1 second) and 1 minute,
as well as the midnight-rollover interrupt are supported.
9.2.2 Alarm
You can set an alarm interrupt by setting the HOURS, MINUTES, and SECONDS fields in
the RTC alarm (RTCALRM) register. An interrupt is enabled when the ALMEN bit in the RTC
interrupt enable register (RTCIENR) is set. An interrupt is posted when the current time
matches the time in the RTCALRM register.
9.2.3 Minute Stopwatch
The minute stopwatch performs a countdown with a one minute resolution. It generates an
interrupt when the programmable length of time (in minutes) expires. For example, to save
power, you can use the minute stopwatch to turn off the LCD display after a minute of idle.
At consecutive minute increments, the minute stopwatch value is decremented. The
interrupt is generated when the counter counts to -1.
9.3 PROGRAMMING MODEL
9.3.1 RTC Hours/Minutes/Seconds Register
The real-time clock hours/minutes/seconds register (HMSR) is not affected by the RESET
signal. This allows the real-time clock to continue keeping time when the system is reset. At
power-up, this register may contain a random value. Therefore, you may want to program it
with the current time. The HOURS, MINUTES, and SECONDS fields can be read or written
at any time. After a write, the current time assumes the newly written values. Unused bits
read 0.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68330FE25 | 32-BIT, 25.16 MHz, MICROPROCESSOR, PQFP132 |
| MC68330FE8V | 32-BIT, 8.39 MHz, MICROPROCESSOR, PQFP132 |
| MC68330CFE8V | 32-BIT, 8.39 MHz, MICROPROCESSOR, PQFP132 |
| MC68330FE16 | 32-BIT, 16.78 MHz, MICROPROCESSOR, PQFP132 |
| MC68332ACFV25 | 32-BIT, 25 MHz, MICROCONTROLLER, PQFP144 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68328UM | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Integrated Portable System Processor-DragonBall |
| MC68330 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated CPU32 Processor |
| MC68330CFE16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated CPU32 Processor |
| MC68330CFE8V | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated CPU32 Processor |
| MC68330CFG16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated CPU32 Processor |
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