原标题：Microchip PIC32 MCU音频开发方案

　　microchip公司的PIC32系列MCU采用5级流水线MIPS32® M4K® 32位内核,工作频率80MHz,在零等待状态闪存接入时的性能为1.56 DMIPS/MHz (Dhrystone 2.1), MCU工作电压2.3V- 3.6V,具有众多的外设,有两个编程和调试接口,多达16路10位ADC和两个模拟比较器,主要用于超小型图像/用户接口,以太网/USB/CAN/连接,多任务嵌入控制和高性能音频.本文介绍了PIC32 MCU主要特性,方框图,以及PIC32音频开发板主要特性及主要元件,电路图和PCB布局图.

　　Microchip’s 32-bit portfolio with the MIPS® M4K® offers high performance microcontrollers, and all the tools needed to develop your embedded project. With free software, low cost development tools, and pin/peripheral compatibility from 16-bit product lines, PIC32 MCUs shorten time to market and allow your designs to grow. PIC32 gives your application the processing power, memory and peripherals your design needs!

　　PIC32 MCU主要特性:

　　High-Performance 32-bit RISC CPU:

　　• MIPS32® M4K® 32-bit core with 5-stage pipeline

　　• 80 MHz maximum frequency

　　• 1.56 DMIPS/MHz (Dhrystone 2.1) performance at zero Wait state Flash access

　　• Single-cycle multiply and high-performance divide unit

　　• MIPS16e® mode for up to 40% smaller code size

　　• Two sets of 32 core register files (32-bit) to reduce interrupt latency

　　• Prefetch Cache module to speed execution from Flash

　　Microcontroller Features:

　　• Operating voltage range of 2.3V to 3.6V

　　• 64K to 512K Flash memory (plus an additional 12 KB of Boot Flash)

　　• 16K to 128K SRAM memory

　　• Pin-compatible with most PIC24/dsPIC® DSC devices

　　• Multiple power management modes

　　• Multiple interrupt vectors with individually programmable priority

　　• Fail-Safe Clock Monitor mode

　　• Configurable Watchdog Timer with on-chip Low-Power RC oscillator for reliable operation Peripheral Features:

　　• Atomic SET, CLEAR and INVERT operation on select peripheral registers

　　• Up to 8-channels of hardware DMA with automatic data size detection

　　• USB 2.0-compliant full-speed device and

　　On-The-Go (OTG) controller:

　　- Dedicated DMA channels

　　• 10/100 Mbps Ethernet MAC with MII and RMII interface:

　　Dedicated DMA channels

　　• CAN module:

　　- 2.0B Active with DeviceNet™ addressing support

　　- Dedicated DMA channels

　　• 3 MHz to 25 MHz crystal oscillator

　　Peripheral Features (Continued):

　　• Internal 8 MHz and 32 kHz oscillators

　　• Six UART modules with:

　　- RS-232, RS-485 and LIN support

　　- IrDA® with on-chip hardware encoder and decoder

　　• Up to four SPI modules

　　• Up to five I2C™ modules

　　• Separate PLLs for CPU and USB clocks

　　• Parallel Master and Slave Port (PMP/PSP) with 8-bit and 16-bit data, and up to 16 address lines

　　• Hardware Real-Time Clock and Calendar (RTCC)

　　• Five 16-bit Timers/Counters (two 16-bit pairs combine to create two 32-bit timers)

　　• Five Capture inputs

　　• Five Compare/PWM outputs

　　• Five external interrupt pins

　　• High-speed I/O pins capable of toggling at up to 80 MHz

　　• High-current sink/source (18 mA/18 mA) on all I/O pins

　　• Configurable open-drain output on digital I/O pins

　　Debug Features:

　　• Two programming and debugging Interfaces:

　　- 2-wire interface with unintrusive access and real-time data exchange with application

　　- 4-wire MIPS® standard enhanced Joint Test Action Group (JTAG) interface

　　• Unintrusive hardware-based instruction trace

　　• IEEE Standard 1149.2 compatible (JTAG) boundary scan

　　Analog Features:

　　• Up to 16-channel, 10-bit Analog-to-Digital Converter:

　　- 1 Msps conversion rate

　　- Conversion available during Sleep and Idle

　　• Two Analog Comparators

　　PIC32 MCU主要应用:

　　High Impact Graphics/User Interfaces

　　Ethernet/USB/CAN/Connectivity

　　Multitasking Embedded Control

　　High Performance Audio

　　图1.PIC32 MCU方框图

　　PIC32音频开发板

　　Audio Development Board

　　The audio development board for PIC32 (DM320011) provides developers a flexible platform for 24-bit audio record and playback, USB Digital Audio, MP3 Decode and Sample Rate Conversion. The board also provides an interface to Microchip’s 16/32-bit PIC® MCU Accessory Development Platform for iPod and iPhone enabling Apple® authorized MFi licensees.

　　PIC32音频开发板主要特性:

　　• High-performance MCU

　　• Wolfson WM8960 audio codec with up to 48 kHz sampling rate and up to 24-bit resolution

　　• Headphone out, Line-in jacks, and an on-board MIC

　　• TFT color display with 220x176 resolution

　　• PICtail™ Plus Connector

　　• General purpose user switches and LEDs

　　图2.音频开发板外形图和元件分布图

　　音频开发板元件表: