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1. High-Performance RISC CPU
1. Only 35 instructions to learn:
- All single-cycle instructions except branches
2. Operating speed:
- DC – 20 MHz oscillator/clock input
- DC – 200 ns instruction cycle
3. Program Memory Read (PMR) capability
4. Interrupt capability
5. 8-level deep hardware stack
6. Direct, Indirect and Relative Addressing modes
2. Special Microcontroller Features
1. Precision Internal Oscillator:
- Factory calibrated to ±1%, typical
- Software selectable frequency range of 8 MHz to 125 kHz
- Software tunable
- Two-Speed Start-up mode
- External Oscillator fail detect for critical applications
- Clock mode switching during operation for power savings
2. Software selectable 31 kHz internal oscillator
3. Power-Saving Sleep mode
4. Wide operating voltage range (2.0V-5.5V)
5. Industrial and Extended temperature range
6. Power-on Reset (POR)
7. Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
8. Brown-out Reset (BOR) with software control option
9. Enhanced Low-Current Watchdog Timer (WDT) with on-chip oscillator (software selectable nominal 268 seconds with full prescaler) with software enable
10. Multiplexed Master Clear with pull-up/input pin
11. Programmable code protection
12. High-Endurance Flash/EEPROM cell:
- 100,000 write Flash endurance
- 1,000,000 write EEPROM endurance
- Flash/Data EEPROM retention: > 40 years

3. Low-Power Features
1. Standby Current:
- <100 nA @ 2.0V, typical
2. Operating Current:
- 11 μA @ 32 kHz, 2.0V, typical
- 220 μA @ 4 MHz, 2.0V, typical
3. Watchdog Timer Current:
- 1 μA @ 2.0V, typical

4. Peripheral Features
1. Liquid Crystal Display module:
- Up to 60/96/168 pixel drive capability on 28/40/64-pin devices, respectively
- Four commons
2. Up to 24/35/53 I/O pins and 1 input-only pin:
- High-current source/sink for direct LED drive
- Interrupt-on-change pin
- Individually programmable weak pull-ups
3. In-Circuit Serial Programming™ (ICSP™) via two pins
4. Analog comparator module with:
- Two analog comparators
- Programmable on-chip voltage reference (CVREF) module (% of VDD)
- Comparator inputs and outputs externally accessible
5. A/D Converter:
- 10-bit resolution and up to 8 channels
6. Timer0: 8-bit timer/counter with 8-bit programmable prescaler
7. Enhanced Timer1:
- 16-bit timer/counter with prescaler
- External Timer1 Gate (count enable)
- Option to use OSC1 and OSC2 as Timer1 oscillator if INTOSCIO or LP mode is selected
8. Timer2: 8-bit timer/counter with 8-bit period register, prescaler and postscaler
9. Addressable Universal Synchronous Asynchronous Receiver Transmitter (AUSART)
10. Up to 2 Capture, Compare, PWM modules:
- 16-bit Capture, max. resolution 12.5 ns
- 16-bit Compare, max. resolution 200 ns
- 10-bit PWM, max. frequency 20 kHz
11. Synchronous Serial Port (SSP) with I2C™
5. Pin configuration
