PIC18F2221/2321/4221/4321 8-Bit Microcontrollers The PIC18F Microcontrollers from Microchip are the most capable 8-bit devices within Microchip’s offer. Available within the range is CAN, LIN and Ethernet capability as part of a comprehensive range of peripherals to meet the needs of embedded applications and versions featuring XLP (Extreme Low-Power) Technology for where power consumption is a key consideration.

The PIC18F2221/2321/4221/4321 family of Microcontrollers is based upon Microchip’s PIC18 architecture offering a 31 level hardware stack and 77 instructions. These MCUs provide up to 10 MIPS, up to 8 Kbytes program memory with 512 bytes RAM and Data EEPROM of 256 bytes. On board is a configurable oscillator with ±1% accuracy. Microcontroller Features 40 MHz Max. CPU Speed
77 Instructions
31 Level Hardware Stack
Configurable Internal Oscillator – Selectable Frequency Range 8 MHz to 31 kHz
25 I/O Pins – PIC18F2221/2321 Models
36 I/O Pins – PIC18F4221/4321 Models
nanoWatt XLP Technology
Power-On Reset (POR)
Power-Up Timer (PWRT)
Oscillator Start-Up Timer (OST)
Brown-Out Reset (BOR)
Extended Watchdog Timer (WDT)
Low-Voltage Programming (LVP)
In-Circuit Serial Programming (ICSP)
In-Circuit Debug (ICD) Peripherals 10-bit Analogue to Digital Converter (ADC) – PIC18F2221/2321 10 Channels; PIC18F4221/4321 13 Channels
One Enhanced Capture, Compare, PWM Module – PIC18F4221/4321 Models Only
Capture, Compare, PWM Module – PIC18F2221/2321 x 2; PIC18F4221/4321 x 1
Two Comparators
One 8-bit Timers
Three 16-bit Timers
High/Low-Voltage Detection (HLVD) Module
Master Synchronous Serial Port (MSSP) Module with SPI and I2C
Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART)