EM6812F2TP24B datasheet(51/81 Pages) EMMICRO

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EM6812

www.emmicroelectronic.com

13 Timers

13.1

Basic features:

The EM6812 contains 4 identical, individual configurable 8-bit timers. They may be used standalone or chained together as

2 x 16-bit timers. Possible configurations are

•

4 x 8-bit:

Timer1, Timer2, Timer3, Timer4

•

2 x 8-bit, 1 x 16-bit

Timer1, Timer2, Timer34

Timer12, Timer3, Timer4

•

2 x 16-bit

Timer12, Timer34

Each timer can work with input signals from port A (clock start, stop, input capture), output PWM or frequency signals on

port B, and generating interrupt signals on ‘zero’ or 'compare' match conditions.

Each timer has its own configuration bits and setup registers.

•

Input clock source (external inputs and prescaler clock frequencies), select 1 out of 8.

•

Start condition (software write or external condition); select 1 out of 8.

•

Auto-Reload or Zero-Stop mode.

•

Pulse Width Modulation (PWM) and Frequency generation.

•

Interrupts source (compare or zero).

•

Timer value read on the fly.

When chained together as a 16bit Timer34, the Timer4 will take over the full configuration of the Timer3. Same thing applies

for Timer12.

The basic timer function is counting from the start value down to hex 00, then an interrupt is generated and the timer stops.

With the autorelod bit set, the timer reloads the start value after reaching zero and so runs in an endless loop until stopped.

At every zero detect an interrupt signal is generated.

With PWM bit set, a pulse width modulated signal can be output directly and inverted on port B. Pulse width and period

depend on the timer compare and timer load value. Either the compare condition or zero condition can create an interrupt.

Frequency generation is done in PWM mode by selecting the desired signal period (load value) and putting the compare

value on half the period.

Figure 27. Timer architecture

8/16 bit timer

status

Timer load

value

PWM

Comparator

IRQ_Comp

IRQ_Zero

PWM

Freq generation

Ext._start

Ext._clk

CPU_Start

int._clk

Auto Reload

Start/stop

Timer compare

value

IRQ Timer

Enable

Enable PWM

Timer

configuration

Clock source

Start source

PWM generation

Interrupt source

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