PIC12F615 datasheet(88/168 Pages) MICROCHIP

88 / 168 page

PIC12F609/615/12HV609/615

DS41302A-page 86

Preliminary

10.4.2

START-UP CONSIDERATIONS

When any PWM mode is used, the application

hardware must use the proper external pull-up and/or

pull-down resistors on the PWM output pins.

The CCP1M<1:0> bits of the CCP1CON register allow

the user to choose whether the PWM output signals are

active-high or active-low for each PWM output pin (P1A

and P1B). The PWM output polarities must be selected

before the PWM pin output drivers are enabled.

Changing the polarity configuration while the PWM pin

output drivers are enable is not recommended since it

may result in damage to the application circuits.

The P1A and P1B output latches may not be in the proper

states when the PWM module is initialized. Enabling the

PWM pin output drivers at the same time as the

Enhanced PWM modes may cause damage to the

application circuit. The Enhanced PWM modes must be

enabled in the proper Output mode and complete a full

PWM cycle before configuring the PWM pin output

drivers. The completion of a full PWM cycle is indicated

by the TMR2IF bit of the PIR1 register being set as the

second PWM period begins.

Note:

When the microcontroller is released from

Reset, all of the I/O pins are in the

high-impedance state. The external cir-

cuits must keep the power switch devices

in the OFF state until the microcontroller

drives the I/O pins with the proper signal

levels or activates the PWM output(s).

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