LButtonDEVICE OVERVIEW
The PIC16LF1902/3 are described within this data sheet. They are available in 28-pin packages. Figure 1-1 shows a block diagram of the PIC16LF1902/3 devices. Table 1-2 shows the pinout descriptions.
Reference Table 1-1 for peripherals available per device.

High-Performance RISC CPU:
• C Compiler Optimized Architecture
• Only 49 Instructions
• Up to 7 Kbytes Self-Write/Read Flash Program Memory Addressing
• Up to 256 Bytes Data Memory Addressing
• Operating Speed:
   - DC – 20 MHz clock input @ 3.6V
   - DC – 16 MHz clock input @ 1.8V
   - DC – 200 ns instruction cycle
• Interrupt Capability with Automatic Context Saving
• 16-Level Deep Hardware Stack with Optional Overflow/Underflow Reset
• Direct, Indirect and Relative Addressing modes:
   - Two full 16-bit File Select Registers (FSRs)
   - FSRs can read program and data memory

Flexible Oscillator Structure:
• 16 MHz Internal Oscillator:
   - Accurate to ±10%, typical
   - Software selectable frequency range from 16 MHz to 31.25 kHz
• 31 kHz Low-Power Internal Oscillator
• Three External Clock modes up to 20 MHz
• Two-Speed Oscillator Start-up

Special Microcontroller Features:
• Operating Voltage Range:
   - 1.8V-3.6V
• Self-Programmable under Software Control
• Power-on Reset (POR)
• Power-up Timer (PWRT)
• Ultra Low-Power Brown-Out Reset (ULPBOR)
• Extended Watchdog Timer (WDT)
• In-Circuit Serial Programming™ (ICSP™) via Two Pins
• In-Circuit Debug (ICD) via Two Pins
• Enhanced Low-Voltage Programming (LVP)
• Programmable Code Protection
• Power-Saving Sleep mode

PIC16LF1902/3 Low-Power Features:
• Standby Current:
   - 60 nA @ 1.8V, typical
• Operating Current:
   - 7.0 μA @ 32 kHz,1.8V, typical
   - 150 μA @ 1 MHz, 1.8V, typical
• Timer1 Oscillator Current:
   - 600 nA @ 32 kHz, 1.8V, typical
• Low-Power Watchdog Timer Current:
   - 500 nA @ 1.8V, typical

Analog Features:
• Analog-to-Digital Converter (ADC):
   - 10-bit resolution, up to 11 channels
   - Conversion available during Sleep
   - Dedicated ADC RC oscillator
   - Fixed Voltage Reference (FVR) as channel
• Integrated Temperature Indicator
• Voltage Reference module:
   - Fixed Voltage Reference (FVR) with 1.024V and 2.048V output levels

Peripheral Highlights:
• Up to 25 I/O Pins and 1 Input-only Pin:
   - High current 25 mA sink/source
   - Individually programmable weak pull-ups
   - Individually programmable interrupt-on change (IOC) pins
• Integrated LCD Controller:
   - 19 segment pins and 72 total segments
   - Variable clock input
   - Contrast control
   - Internal voltage reference selections
• Timer0: 8-Bit Timer/Counter with 8-Bit Programmable Prescaler
• Enhanced Timer1:
   - 16-bit timer/counter with prescaler
   - External Gate Input mode
   - Dedicated low-power 32 kHz oscillator driver