The C8051F120-GQ is a Precision Analogue 8-bit Microcontroller Unit includes up to 128kB of on-chip Flash with 8kB of RAM. On-board JTAG debug circuitry allows non-intrusive, full speed, in-circuit debugging using the production MCU installed in the final application. This debug system supports inspection and modification of memory and registers, setting breakpoints, watch-points, single stepping, run and halt commands. All analogue and digital peripherals are fully functional while debugging using JTAG.