7.3.3 Grayscale Configuration

The TLC6C5724-Q1 device implements a grayscale configuration function to realize the individual PWM dimming function for the output channels. The grayscale has three global configuration modes, 12-bit, 10-bit and 8-bit. The GCLK input provides the clock source for the internal PWM generator. The GS counter counts the GCLK number and compares the number with the channel grayscale register value. The output channel turns off when the GS counter value reaches the grayscale register value. Figure 22 shows the detailed block diagram of the PWM generator.

To restart a new PWM cycle, users can use two methods. One is to toggle the BLANK pin after the GS counter reaches the maximum count value, because BLANK low resets the GS counter and BLANK high restarts the GS counter. Another is to pull BLANK high and set the AUTO_REPEAT&TIMING_RESET register bit to 1. The PWM starts a new cycle automatically after the GS counter reaches the maximum count value.

Figure 22. PWM Generator