EM78P372KSS20 datasheet(77/118 Pages) EMC

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EM78P372K

8-bit Microcontroller

Product Specification (V1.4) 05.11.2016

 69

(This specification is subject to change without prior notice)

7.9

Timer

7.9.1

Overview

Timer 1 (TMR1) and Timer 2 (TMR2) (TMRX) are 8-bit clock counters with

programmable prescalers. They are designed for the PWM module as baud rate clock

generators. TMRX can be read only. The Timer 1 and Timer 2 will stop running when

sleep mode occurs with AD conversion not running. However, if AD conversion is

running when sleep mode occurs, Timer 1 and Timer 2 will keep on running.

7.9.2

Function Description

Data Bus

PRD1

Comparator

TMR1

Period

Match

PRD2

Comparator

TMR2

Period

Match

To TMR1IF(PWM1IF)

To TMR2IF(PWM2IF)

reset

MUX

T1P2 T1P1 T1P0 T1EN

1:2

1:4

1:8

1:64

1:1

1:16

1:128

1:256

Fosc

T2P2 T2P1 T2P0 T2EN

MUX

1:4

1:8

1:2

1:64

1:1

1:16

1:128

1:256

Figure 7-26 Timer Block Diagram

Where:

Fosc: Input clock.

Prescaler (T1P2, T1P1 and T1P0 / T2P2, T2P1 and T2P0): The options 1:1, 1:2, 1:4,

1:8, 1:16, 1:64, 1:128, and 1:256 are defined by TMRX. It is cleared when any type of

reset occurs.

TMR1 and TMR2: Timer X register. TMRX is increased until it matches with PRDX,

and then is reset to “0” (default value).

DT1 and DT2: Timer X register. TMRX is increased until it matches with DTX, and

then is reset to “0” (default value).

PRDX (PRD1, PRD2): PWM time period register

Comparator X (Comparator 1 and Comparator 2): Reset TMRX while a match

occurs. The TMRXIF (PWMXIF) flag is set at the same time.

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