STM32-QFP144, Programmer Adapter Yamaichi IC Test & Burn-in Socket with a simple board, specifically designed for STM32 microcontroller in QFP144( 0.5 mm pitch) package 20-pin JTAG/SWD port and/or 4-pin USART1 interface for programming/testing External crystal can be connected via on board socket for system clock Onboard 32.768K crystal oscillator