Details: 

 Characteristics of performance parameters: 
 ? only 42 word instructions. 
 ? All instruction is one instruction cycle in addition to program branch is two cycles 
 ? 13-bit wide instructions. 
 ? GOTO instruction (no limit ROM.) 
 ? CALL instruction. (No limit ROM.) 
 ? 8-bit wide data bus. 
 ? 5 layers deep hardware stack. 
 ? Operating speed: DC-20 MHz crystal oscillator 
 ? RC oscillator DC-16 MHz 

 ? Direct, indirect addressing mode to access the data. 
 ? 8-bit real time clock / counter (Timer0) with 8-bit programmable prescaler (prescaler). 
 ? Internal Power on reset (POR). 
 ? Built-in low-voltage detector (low voltage detector LVD) for Brown out reset (BOR) to use. 
 ? Power on reset timer (Power-up reset timer PWRT) and the oscillation start timer (Oscillator Start-up Timer OST). 
 ? chip watchdog timer (WDT) is to use the internal oscillator to ensure the normal operation of the chip. Software controls the watchdog Enable / disable. 
 ? Two I / O ports IOA and IOB direction can be independently controlled. 
 ? Software can control I / O port of the above pull-pull or open drain resistance. 
 ? an internal break in the source: Timer0 overflow; 
 ? interruption of two external sources: INT pin is triggered, B port input changes. 
 ? Sleep wake triggered by the INT pin or Port B input change. 
 ? Power saving sleep mode. 
 ? code protection. 
 ? Selectable oscillator type: 
 1. RC: Resistor / Capacitor Oscillator 
 2. XT: Crystal / Resonator Oscillator 
 3. HF: High Frequency Crystal / Resonator Oscillator 
 4. LF: Low Frequency Crystal / Resonator Oscillator 
 ? Operating voltage range: 
 - OTP: 2.3V to 5.5V 
 - MASK: 2.3V to 5.5V