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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPMCK16Z4MPV20 датащи(PDF) 133 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV20 датащи(HTML) 133 Page - Freescale Semiconductor, Inc |
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133 / 500 page  M68HC16 Z SERIES SYSTEM INTEGRATION MODULE USER’S MANUAL 5-27 Figure 5-9 is a block diagram of the watchdog timer and the clock control for the pe- riodic interrupt timer. Figure 5-9 Periodic Interrupt Timer and Software Watchdog Timer 5.4.6 Periodic Interrupt Timer The periodic interrupt timer (PIT) allows the generation of interrupts of specific priority at predetermined intervals. This capability is often used to schedule control system tasks that must be performed within time constraints. The timer consists of a prescaler, a modulus counter, and registers that determine interrupt timing, priority and vector as- signment. Refer to 4.13 Exceptions for further information about interrupt exception processing. Table 5-10 Software Watchdog Divide Ratio SWP SWT[1:0] Divide Ratio 000 29 001 211 010 213 011 215 100 218 101 220 110 222 111 224 FREEZE EXTAL CRYSTAL OSCILLATOR 1281 XTAL MODCLK 29 PRESCALER CLOCK SELECT CLOCK SELECT AND DISABLE SWP PTP 4 (8-BIT MODULUS COUNTER) PIT INTERRUPT (215 DIVIDER CHAIN — 4 TAPS) PERIODIC INTERRUPT TIMER PICR PITR SOFTWARE WATCHDOG TIMER SWSR LPSTOP SWE SWT1 SWT0 SOFTWARE WATCHDOG RESET PIT WATCHDOG BLOCK 16 NOTES: 1. ÷ 128 IS PRESENT ONLY ON DEVICES WITH A FAST REFERENCE OSCILLATOR. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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