User`s guide

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MCP1630 BOOST MODE LED DRIVER

DEMO BOARD USER’S GUIDE

© 2007 Microchip Technology Inc. DS51665B-page 21

Appendix C. Firmware Flowchart

FIGURE C-1: Firmware Flowchart - Page 1.

Start

Output V

REF

Signal

through GP5

(Reference Voltage for

MCP1630 )

Setup CCP module

and 20% duty cycle

(Clock for MCP1630)

Is GP1 = 1?

YES

NO

Clear the

Potentiometer flag

Start ADC

ADC

or Channel3

CH1

CH3

Set ADC for CH3

Is

Potentiometer

Flag set?

YES

Set DimDuty for the

potentiometer output

value

NO

Set DimDuty

for maximum

A

B

Initialize: GP2 (for Output PWM)

And GP5 (for Output V

REF

Internal Osc Clock to 8 MHz, TMR0 = 0

Configure Ansel & CMCON0 as Digital I/O

Set Weak Pull-Up on GP1

1. Clear Weak Pull-Up on GP1

2. Set a Flag for Potentiometer

Detected

3. Set GP1 for Analog Input

Channel1

duty cycle