Select High Speed or Normal Speed Mode
The JP1 and JP2 are used to select high-speed mode or normal speed mode; the clock is 7.3728MHZ for high-speed mode, and 1.8432MHZ for normal speed mode. For high speed mode, the baud rate speed up to 460K.
Pin
Clock Rate
Mode
Short 1,2
1.8432MHZ
Normal Speed
Short 2,3
7.3728MHZ
High Speed