SYNPWM datasheet(24/57 Pages) FEELING

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FM8P73B

Web site: http://www.feeling-tech.com.tw

Rev1.0 Nov 20, 2013

P.24/FM8P73B

FEELING

TECHNOLOGY

2.3

Timer/Event Counter (TMR1, TMR2, TMR3)

The FM8P73B contains three 8-bit down-count Timers. All these timers have auto reload function, TMR1/TMR2

can be combined to perform PWM function

Figure 2.4: Block Diagram of the Timer

MUX

TxSO<1:0>

Prescaler

TxPS<2:0>

TxLOAD

Set TxIF flag

on unerflow

TMRx

Counter

TMRx

Latch

TMCKI (IOB2)

Fosc*2

(Only Timer1 & 2)

Fosc

Instruction Cycle

(Fosc/2 or Fosc/4)

0 0

0 1

1 0

1 1

WR TxLA

2.3.1

Clock Source

There are 4 clock sources could be selected by each timer separately.

2.3.1.1

TMCKI (IOB2)

The event counter mode would be activated when the source of TMCKI (IOB2) used. At this mode, the rising/

falling edge of the event could also be selected separately.

2.3.1.2

Instruction cycle

In this mode, the timer will down-count on every instruction cycle (if prescaler is 1:1).

2.3.1.3

FOSC

In this mode, timer clock source defined by the FOSC bit in the configuration word.

2.3.1.4

FOSC *2

In this mode, the oscillator frequency is multiplied by 2, as the timer clock source. Oscillator modes defined by the

FOSC bit in the configuration word.

Note : 1.

In this mode, the frequency multiplier minimum operating voltage limits, please refer to

electrical characteristics table VPWM item.

This mode only for Timer1 and Timer2.

2.3.2

Prescaler

Each timer contains a 3-bits prescaler which can scale the timer or counter from 1:1 to 1:128.

T1PS2 : T1PS0

TMR1 Prescal rate

1:1

1:2

1:4

1:8

1:16

1:32

1:64

1:128

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