This is the F1680 Dual 44-pin development board with two S8F1680 44-pin LQFP MCU’s connected as I2C master and slave. The master is clocked by an internal 11 MHz IPO and the slave has an optional 20 MHz crystal. It also has the option of master control of the external DAC by I2C and optional external DAC output to the slave ADC input. The master interface has the ability to download and debug code into the master or slave, and the master can also download code into the slave device.