EM78P372KSS20 datasheet(75/118 Pages) EMC

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EM78P372K

8-bit Microcontroller

Product Specification (V1.4) 05.11.2016

 67

(This specification is subject to change without prior notice)

Note

The value in the dead-time register must be less than the value in the duty

cycle register in order to prevent unexpected behavior on both of PWM

outputs.

7.8.2

Increment Timer Counter (TMRX: TMR1 or TMR2)

TMRX are 8-bit clock counters with programmable prescalers. They are designed for

the PWM module as baud rate clock generators. If employed, they can be turned off for

power saving purposes by setting the T1EN bit [BANK1-R8<6>] or T2EN bit

[BANK1-R8<7

>] to “0”.

TMR1 and TMR2 are internal designs and can be read only

7.8.3

PWM Time Period (TMRX: TMR1 or TMR2)

PPWM Time Period (PRDX: PRD1 or PRD2) The PWM time period is defined by

writing to the PRDX register. When TMRX is equal to PRDX, the following events

occur on the next increment cycle:

1) TMR is cleared

2) The PWMX

pin is set to “1”

3) The PWM duty cycle is latched from DT1/DT2 to DL1/DL2

NOTE

The PWM output will not be set, if the duty cycle is “0”.

4) The PWMXIF pin is set to “1”

The following formula describes how to calculate the PWM time period:









value

prescale

TMRX

FOSC

PRDX

Period





















Example:

PRDX=49; Fosc=4 MHz; TMRX (0, 0, 0) = 1:1,

then



























Period

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