ZUSBOPTSC01ZAC datasheet(117/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

Timer Operating Modes

Z8FMC16100 Series Flash MCU

Product Specification

c. Set the prescale value.

d. If using the Timer Output alternate function, set the initial output level (High or

Low) via the TPOL bit.

e. Set the INTERRUPT mode.

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

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

4. If appropriate, enable the timer interrupt and set the timer interrupt priority by writing

to the relevant interrupt registers.

5. If using the Timer Output function, configure the associated GPIO port pin for the

Timer Output alternate function.

6. Write to the Timer Control 1 Register to enable the timer. Counting does not start until

the appropriate input transition occurs.

The timer period is calculated by the following equation (Start Value is typically = 1):

The one-shot delay from input trigger to output includes the above-defined time-out

period, plus an additional delay of 2–3 system clock cycles, due to the synchronization of

the input trigger.

Continuous Mode

In CONTINUOUS mode, the timer counts up to the 16-bit reload value stored in the Timer

Reload High and Low Byte registers. After reaching the reload value, the timer generates

an interrupt, the count value in the Timer High and Low Byte registers is reset to 0001h,

and counting resumes. Also, if the Timer Output alternate function is enabled, the Timer

Output pin changes state (from Low to High or from High to Low) after timer reload.

The steps for configuring a timer for CONTINUOUS mode and initiating the count are as

follows:

1. Write to the Timer Control registers to:

a. Disable the timer.

b. Configure the timer for CONTINUOUS mode.

c. Set the prescale value.

Triggered One-Shot Mode Time-Out Period(s) =

(Reload Value – Start Value + 1) x Prescaler

System Clock Frequency (Hz)

Note:

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