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Pages 323–325, problems 1–7, 10a, 20, 25, 29, 32 1. How many free-running timers do we have in the HCS12? 1 2. TCNT of the HCS12 is ____-bit. 16-bit 3. For accurate reading, the TCNT is accessed as (8-bit, 16-bit). 8-bit 4. The free-running timer supports a highest prescaler value of ______. 128 5. The free-running timer supports a lowest prescaler value of ______. 1 6. Which register holds the TOF? TFLG2 register 7. How do we enable the free-running timer? TEN D7 bit: 1 = Enable timer Setting to a high value the bit 7 of register TSCR1 10. Find the frequency and period used by the free-running timer if the crystal attached to the HCS12 has the following values: (a) XTAL = 4 MHz Cirstalfeq = 4MHz F= 4MHz/2 F= 2MHz T= 1/F T= 1/2MHz T= 0.5μs
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20. Assume that XTAL = 4 MHz. Find the value needed to generate a time delay of 5 ms. Use the largest prescaler possible. Prescaler = 128 N=(t x F)/128 N=((5x10^-3)x(4MHz/2))/128 N=78.125 25. Program channel 2 for Output Compare to generate a square wave of 1 kHz with 50% duty cycle.
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  • Spring '12
  • Input/output, input capture, free-running timer, TIOS, Input Capture/Output Compare

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