The Microchip Technology PIC18F16Q40-I/SS is a 20 pin low-power, high performance microcontroller with XLP technology for real-time control and sensor applications. It has 32KB program memory size and 20MHz maximum frequency.

Flash program memory
C Compiler Optimized RISC Architecture
Operating Speed: DC-64 MHz clock input, 62.5 ns minimum instruction cycle
Four Direct Memory Access (DMA) controllers
Vectored Interrupt Capability: selectable high/low priority, fixed interrupt latency of three instruction cycles, programmable vector table base address, backwards compatible with previous interrupt capabilities
128-Level deep hardware stack
Low-current Power-ON Reset (POR)
Configurable Power-UP Timer (PWRT)
Brown-Out Reset (BOR)
Low-Power BOR (LPBOR) Option