The Microchip PIC series 8bit MCU has 3.5 KB flash memory, 128B RAM, 22 I/O ports and 28 pins with supply voltage ranging between 2V-5.5V. It's operating temperature ranging between -40°C to +85°C (Industrial).

Only 35 single word instructions to learn
All single cycle instructions except for program branches which are two-cycle
Eight level deep hardware stack
Direct, Indirect and Relative Addressing modes
Power-on Reset (POR)
Power-up Timer (PWRT) and oscillator start-up timer (OST)
Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
Programmable code protection
Power saving SLEEP mode
Selectable oscillator options
Low power, high speed CMOS FLASH/EEPROM technology
Fully static design
In-Circuit Serial Programming(ICSP) via two pins
Processor read/write access to program memory