Z8F021ASH020SC datasheet(94/276 Pages) ZILOG

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PS022815-0206

Timers

Z8 Encore! XP® 4K Series

Product Specification

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Set the Capture edge (rising or falling) for the Timer Input.

2. Write to the Timer High and Low Byte registers to set the starting count value

(typically 0001H).

3. Write to the Timer Reload High and Low Byte registers to set the Compare value.

4. Enable the timer interrupt, if appropriate, and set the timer interrupt priority by writing

to the relevant interrupt registers.By default, the timer interrupt are generated for both

input capture and reload events. If appropriate, configure the timer interrupt to be

generated only at the input capture event or the reload event by setting TICONFIG

field of the TxCTL0 register.

5. Configure the associated GPIO port pin for the Timer Input alternate function.

6. Write to the Timer Control register to enable the timer.

7. Counting begins on the first appropriate transition of the Timer Input signal. No

interrupt is generated by this first edge.

In CAPTURE/COMPARE mode, the elapsed time from timer start to Capture event can be

calculated using the following equation:

Reading the Timer Count Values

The current count value in the timers can be read while counting (enabled). This capability

has no effect on timer operation. When the timer is enabled and the Timer High Byte reg-

ister is read, the contents of the Timer Low Byte register are placed in a holding register. A

subsequent read from the Timer Low Byte register returns the value in the holding register.

This operation allows accurate reads of the full 16-bit timer count value while enabled.

When the timers are not enabled, a read from the Timer Low Byte register returns the

actual value in the counter.

Timer Pin Signal Operation

Timer Output is a GPIO Port pin alternate function. The Timer Output is toggled every

time the counter is reloaded.

The Timer Input can be used as a selectable counting source. It shares the same pin as the

complementary timer output. When selected by the GPIO Alternate Function Registers,

this pin functions as a timer input in all modes except for the DUAL PWM OUTPUT

mode. For this mode, there is no timer input available.

Capture Elapsed Time (s)

Capture Value Start Value

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() Prescale

System Clock Frequency (Hz)

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