User's Manual

L720 EVB User Manual

4 Key Description

L720 development board with a total of 5 top pressure switch and 14 dial switch. 5 top pressure for short

press trigger control, 14 dial switch (single pole double throw) for the long time state toggle switch. The

corresponding function on the L720 development board has a corresponding printing information, the

function of the specific instructions are as follows:

4.1 Power on/off and RESET key

When power supply for the EVB, the power indicator will light up. The lower left corner of the

PWRKEY button on the board, long press 500 MS, can open the module, and press the PWRKEY button

for more time, then reset the module.

Figure 4-1： Power on/off reset key

4.2 FORCED USB download key

The L720 enables modules to enter forced download mode by pressing the FORCED USB BOOT

button, at which point the FORCED USB BOOT will be pulled up to 1.8v. Before the system is

powered on, press the FORCED USB BOOT key and the PWRKEY key at the same time to

enable the L720 module to enter the forced download mode.

Figure 4-2： forced usb download key

4.3 WATCHDOG key

Press the WDOG key and the PWRKEY key at the same time will disable the watchdog function.