EM78P458AP datasheet(40/76 Pages) EMC

40 / 76 page

EM78P458/459

OTP ROM

4.9 Timer

1. Overview

Timer1 (TMR1) and Timer2 (TMR2) (TMRX) are 10-bit clock counters with programmable prescalers,

respectively. They are designed for the PWM module as baud rate clock generators. TMRX can be

read, written, and cleared at any reset conditions.

2. Function description

Fig. 15 shows TMRX block diagram. Each signal and block are described as follows:

Data Bus

PRD1

Comparator

TMR1X

MUX

Period

Match

T1P0

T1P1 T1EN

PRD2

Comparator

TMR2X

MUX

Period

Match

T2P0 T2P1 T2EN

To PWM1IF

To PWM2IF

reset

1:2

1:8

1:32

Fosc

1:64

1:2

1:8

1:32

Fosc

1:64

*TMR1X = TMR1H + TMR1L;

*TMR2X = TMR2H +TMR2L

Fig. 15 TMRX Block Diagram

Fosc

: Input clock.

Prescaler ( T1P0 and T1P1/T2P1 and T2P0 )

: Options of 1:2, 1:8, 1:32, and 1:64 are defined by

TMRX. It is cleared when any type of reset occurs.

TMR1X and TMR2X (TMR1H/TWR1L and TMR2H/TMR2L )

Timer

TMRX

increased until it matches with PRDX, and then is reset to 0. TMRX cannot be read.

PRDX ( PRD1 and PRD2 ):

PWM period register.

ComparatorX ( Comparator 1 and Comparator 2 ):

To reset TMRX while a match occurs and the

TMRXIF flag is set at the same time.

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

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