Datasheet 搜索 > 微控制器 > Microchip（微芯） > PIC18F2420-I/SP 数据手册 > PIC18F2420-I/SP 开发手册 1/24 页
器件3D模型￥ 33.702
PIC18F2420-I/SP 开发手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
DIP-28
描述:
PIC18F2420/2520/4420/4520 8 位微控制器Microchip 的 PIC18F 微控制器是 Microchip 产品线中功能最强大的 8 位设备。 该系列包含的 CAN、LIN 和以太网功能是完整系列外围设备的一部分，可满足嵌入式应用和版本的需求，采用 XLP（极低功耗）技术，用于功耗为关键考量的应用。 PIC18F2420/2520/4420/4520 系列微控制器基于 Microchip 的 PIC18 体系结构，提供 31 级 硬件堆栈和 75 指令。 这些 MCU 提供高达 10 个 MIPS、多达 64 kb 的程序存储器、多达 3896 kb 的 RAM。 板载可配置振荡器。### 微控制器功能40 MHz 最大 CPU 速度 75 指令 - 通过扩展指令集支持 83 指令 31 级硬件堆栈 可配置内部振荡器 - 可选频率范围 8 mHz 至 31 kHz 25 个输入/输出引脚 - PIC18F2420/2520 型号 36 个输入/输出引脚 - PIC18F4420/4520 型号 nanoWatt 技术 通电重置 (POR) 通电计时器 (PWRT) 振荡器启动计时器 (OST) 掉电重置 (BOR) 延长监控计时器 (WDT) 高电压/低电压检测 (HLVD) 模块 低电压编程 (LVP) 在线串行编程 (ICSP) 在线调试 (ICD) ### 外设10 位模拟到数字转换器 (ADC) - PIC18F2420/2520 型号 10 通道；PIC18F4420/4520 13 通道 一个增强型采集、比较、PWM 模块 - 仅 PIC18F4420/4520 型号 采集、比较、PWM 模块 - PIC18F2420/2520 型号 x 2、PIC18F4420/4520 型号 x 1 两个比较器 一个 8 位计时器 三个 16 位计时器 主同步串行端口 (MSSP) 模块，带有 SPI 和 I2C 增强型可寻址通用同步异步接收器发送器 (EUSART) ### PIC18 微控制器展开
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PIC18F2420-I/SP数据手册
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若手册格式错乱，请下载阅览PDF原文件
2010 Microchip Technology Inc. DS01310A-page 1
INTRODUCTION
Microchip’s enhanced Flash microcontrollers enable
firmware to program itself. This is done by a “boot-
loader” providing a firmware kernel, residing in the
microcontroller. The kernel uses a small portion of pro-
gram memory not normally used by the firmware’s
main application.
When the bootloader firmware is activated, a host PC
can use a serial protocol to read, write and verify
updates to the microcontroller's application firmware.
Once the application firmware is programmed, the
bootloader cedes control, allowing normal application
execution until the bootloader is called.
AN1310 Bootloader Features
The key features of the AN1310, “High-Speed Serial
Bootloader for PIC16 and PIC18 Devices” include:
• Small firmware code size (less than 450 instruction
words on most devices)
• Automatic baud rate synchronization to the host
• Baud rate flexibility, from 1,200 bps to 3 Mbps for
extremely fast programming
• A 16-bit CRC packet and Flash memory
verification for quick verification of successful
programming, even at low baud rates
• An advanced “write planner” that eliminates
unnecessary erase/write transactions
• Support for a wide variety of PIC16 and PIC18
devices through an “essential device characteristics”
database
• Optional application remapping that does not
require linker script modifications or remapping of
interrupt service routines
• A forced bootloader re-entry mechanism requiring
minimal start-up delay and no additional I/O pins or
application firmware code to re-enter the bootloader
• Optional MCLR
Reset control, allowing the host
PC application to automatically reset the device
for robust bootloader re-entry
• PC software rewritten in C/C++ for the cross-
platform, Qt
SM
SDK, enabling Linux host support
by recompiling the PC software source code
• A simple, Serial Terminal Application mode,
provided by the PC software, that eliminates time
wasted by switching between separate bootloader
host and serial terminal applications
Prerequisites
Before using the serial bootloader, the following is
required:
• Familiarity with Configuration bits, compiling and
programming PIC
®
microcontrollers
• A development board with a serial port connected
to the PIC device's USART1 RX/TX pins
• A PC with a serial port or USB-to-serial adapter
• A traditional programming tool for initially writing
the bootloader firmware into the PIC device (such
as REAL ICE™ emulator, PICkit™ 3 or MPLAB
®
ICD 3)
• Installation of the MPLAB
®
IDE software
• Installation of the AN1310, high-speed serial
bootloader software
The AN1310 high-speed serial bootloader software
package (including full source code) can be down-
loaded from the www.microchip.com/applicationnotes
web site.
1. When the Browse Application Notes page appears,
go to the Select a Function menu and select
“Bootloader” under “Programming & Bootloaders”.
2. Click the Search button.
3. Scroll down to AN1310 and click the compressed
file icon in the “Resource Type” column.
Author: E. Schlunder
Microchip Technology Inc.
Note: If a review of the preceding features list
indicates that a different bootloader is
needed, see “Alternative References”.
AN1310
High-Speed Serial Bootloader for PIC16 and PIC18 Devices
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