Microchip PIC, PIC Microcontroller, 3.5 kB Flash, 20-Pin QFN

The Microchip 20-Pin flash-based 8 bit CMOS microcontroller has only 35 instructions to learn and all single-cycle instructions except branches. It has 20 MHz oscillator/clock input and 200 ns instruction cycle and 8-level seep hardware stack.

Factory calibrated to ±1%
Software selectable frequency range of 8 MHz to 32 kHz
Software tunable
Two speed start-up mode
Crystal fail detect for critical applications
Clock mode switching during operation for power savings
Power-saving sleep mode
Wide operating voltage range 2.0 V-5.5 V
Industrial and extended temperature range
Power on reset (POR)
Power up timer (PWRT) and Oscillator start up timer (OST)
Brown out reset (BOR) with software control option
Multiplexed master clear with pull-up/input pin
Programmable code protection