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AN666

USAGE GUIDE FOR SIM3U1XX, SIM3C1XX, AND SIM3L1XX DMA AND DTM MODULES

Silicon Laboratories 

AN666

USAGE GUIDE FOR SIM3U1XX, SIM3C1XX, AND

SIM3L1XX DMA AND DTM MODULES

1. Introduction

The Direct Memory Access (DMA) (SiM3U1xx, SiM3C1xx, and SiM3L1xx) and Data Transfer Manager (DTM)

(SiM3L1xx) modules are complex data management modules intended to autonomously transfer data between

peripherals and memory. These modules can save system power consumption by allowing the core to enter a low

power state or process data in parallel to improve performance. This document discusses usage models for these

modules.

SiM3xxxx

Address Space (RAM)

DMA Channel 1

USART0 TX

USART0 RX

DMA Channel 0

Figure 1. Transferring Data using the DMA and DTM modules

2. Key Points

This key topics of this document are:

Using the DMA in a basic memory-to-memory data transfer

Using the DMA from a peripheral-to-memory data transfer

Using the DMA from memory to a peripheral data transfer

Complex multi-channel DMA transfers using the Data Transfer Manager (SiM3L1xx devices only)

3. Relevant Documentation

Precision32 Application Notes are listed on the following website: www.silabs.com/32bit-appnotes.

AN725: Advanced Low Power Techniques for SiM3L1xx Devices

AN667: Getting Started with the Silicon Labs Precision32 IDE

AN670: Integrating Silicon Labs SiM3xxxx Devices into the Keil µVision IDE

Rev. 0.1 9/12

Copyright © 2012 by Silicon Laboratories

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