Nxp Semiconductors UM10317 User Manual

UM10317_1

© NXP B.V. 2008. All rights reserved.

To set-up a blinking demo, repeat step 1 through step 7 as in 

, then do the 

following:

1. In the Mode 2 selection window, check the ‘Group Control’ box to change the mode to 

blinking.

2. Select a color using the PWM cursors.

3. To set a blink cycle, use the GRPPWM cursor to select the duty cycle and use the 

GRPFREQ to select the blink frequency.

4. For example, set the GRPPWM to 0x05 (1.95 % duty cycle) and the GRPFREQ to 

0x17 (1 second) for a short blink every second (see 

).

5. Change the GRPPWM to 0x80 (50 % duty cycle) and the LED will be on for 

0.5 seconds, repeating every second.

6. Change the color of the LEDs by selecting a different PWM value for each LED.

7. Set the GRPPWM to 0x52 (32 % duty cycle) and the GRPFREQ to 0x01 

(0.08 second) and observe the pattern.

8. Change the PWMn values, GRPPWM and GRPFREQ values to create different blink 

patterns.

9. Change the LEDOUT register on one LED output to be controlled only by its PWM, for 

example, ‘LED1 controlled by PWM1’.

10. Change the blink rate and observe the results.

 

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