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參數(shù)資料
| 型號： | S3C70F4XX-AV |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDIP30 |
| 封裝： | 0.400 INCH, SDIP-30 |
| 文件頁數(shù)： | 47/179頁 |
| 文件大?。?/td> | 1070K |
| 代理商： | S3C70F4XX-AV |
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TIMERS and TIMER/COUNTERS
S3C70F2/C70F4/P70F4
11-20
WATCH TIMER
OVERVIEW
The watch timer is a multi-purpose timer consisting of three basic components:
— 8-bit watch timer mode register (WMOD)
— Clock selector
— Frequency divider circuit
Watch timer functions include real-time and watch-time measurement and interval timing for the system clock. It
is also used as a clock source for generating buzzer output.
Real-Time and Watch-Time Measurement
To start watch timer operation, set bit 2 of the watch timer mode register, WMOD.2, to logic one. The watch timer
starts, the interrupt request flag IRQW is automatically set to logic one, and interrupt requests commence in 0.5-
second intervals.
Since the watch timer functions as a quasi-interrupt instead of a vectored interrupt, the IRQW flag should be
cleared to logic zero by program software as soon as a requested interrupt service routine has been executed.
Using a System Clock Source
The watch timer can generate interrupts based on the system clock frequency. The system clock (fx) is used as
the signal source, according to the following formula:
Watch timer clock (fw) =
System clock (fx)
128
= 32.768 kHz
(assuming fx = 4.19 MHz)
Buzzer Output Frequency Generator
The watch timer can generate a steady 2 kHz, 4 kHz, 8 kHz, or 16 kHz signal to the BUZ pin. To select the BUZ
frequency you want, load the appropriate value to the WMOD register. This output can then be used to actuate
an external buzzer sound. To generate a BUZ signal, three conditions must be met:
— The WMOD.7 register bit at F89H.3 is set to "1"
— The output latch for I/O port 6.3 is cleared to "0"
— The port 6.3 output mode flag (PM6.3) set to 'output' mode
Timing Tests in High-Speed Mode
By setting WMOD.1 (F88H.1) to "1", the watch timer will function in high-speed mode, generating an interrupt
every 3.91 ms. At its normal speed (WMOD.1 = '0'), the watch timer generates an interrupt request every 0.5
seconds. High-speed mode is useful for timing events for program debugging sequences.
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