This document describes the features and characteristics of the PIC18F2420/2520/4420/4520 series flash microcontrollers produced by Microchip. These microcontrollers feature 10-bit A/D and nanoWatt technology, and come in 28/40/44-pin enhanced flash variants.
This document describes the PIC18F2420, PIC18F2520, PIC18F4420 and PIC18F4520 8‑bit flash microcontrollers. It covers their core architecture, enhanced flash memory, low‑power modes, and a range of peripheral modules such as timers, ADCs, comparators, and communication interfaces.
The datasheet includes detailed pin‑out diagrams, memory maps, electrical specifications, and recommended operating conditions. It also provides guidance on oscillator options, power‑management settings, and programming interfaces for developers and system designers. This manual is written in Chinese.
| Operating voltage range | 2.0 V to 5.5 V |
|---|---|
| Sleep mode current (typical) | 0.1 µA |
| Idle mode current (typical) | 5.8 µA |
| Flash program memory size | 16 KB (PIC18F2420/4420) / 32 KB (PIC18F2520/4520) |
| EEPROM endurance | 1,000,000 write‑erase cycles |
| Maximum clock frequency | 40 MHz |
The device draws about 0.1 µA in sleep mode (typical).
It operates from 2.0 V up to 5.5 V.
The PIC18F2520 provides 32 KB of flash program memory.
The 40‑pin devices have 13 ADC channels.