The PIC18F4550 is a 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology. The following are the features:-
• High-Current Sink/Source: 25 mA/25 mA
• Three External Interrupts
• Four Timer modules (Timer0 to Timer3)
• Up to 2 Capture/Compare/PWM (CCP) modules:
– Capture is 16-bit, max. resolution 5.2 ns (TCY/16)
– Compare is 16-bit, max. resolution 83.3 ns (TCY)
– PWM output: PWM resolution is 1 to 10-bit
• Enhanced Capture/Compare/PWM (ECCP) module:
– Multiple output modes
– Selectable polarity
– Programmable dead time
– Auto-shutdown and auto-restart
• Enhanced USART module: LIN bus support
• Master Synchronous Serial Port (MSSP) module Supporting 3-Wire SPI (all 4 modes) and I2C™ Master and Slave modes
• 10-Bit, Up to 13-Channel Analog-to-Digital Converter (A/D) module with Programmable Acquisition Time
• Dual Analog Comparators with Input Multiplexing
Specification:-
| Parameter | Value |
| Program Memory Type | Flash |
| Program Memory Size (KB) | 32 |
| CPU Speed (MIPS/DMIPS) | 12 |
| SRAM (B) | 2048 |
| Temperature Range (°C) | -40 to 125 |
| Operating Voltage Range (V) | 2 to 5.5 |
| Pin Count | 40 |
| Timers | 1x 8-bit, 3 x 16-bit |
| ADC Input | 13 ch, 10-bit |
| Capture/Compare/PWM Peripherals | 1 CCP, 1 ECCP |
| Digital Communication Peripherals | 1-UART, 1-SPI, 1-I2C |
| Data EEPROM/HEF (bytes) | 256 |





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