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MEB/0404

12-bits DACs + DMA Completes SCoC

• Two 12-bit DACs

• Three DMA Channels

DAC12_0

Timer_B

Timer_A

Group

Load

Software

DAC12_1

DMA0

2 MCLK

DAC12

External

DMAREQ

DMA2

Timer_A

Timer_B

ADC12

USART0

USART1

MPY

DMA1

DMA2

Complete

Address

Space

The DAC12 module is a 12-bit, R-ladder, voltage output DAC.

•The DAC12 can be configured in 8- or 12-bit mode and may be used in conjunction with the DMA

controller. Multiple DAC12 modules may be grouped together for synchronous update operation.

Features of the DAC12 include:

•12-bit monotonic output

•Programmable settling time vs power consumption

•Internal or external reference selection

•Straight binary or 2’s compliment data format

•Self-calibration option for offset correction

•Multiple DAC12 modules can be grouped for simultaneous update

•8- or 12-bit voltage output resolution

The direct memory access (DMA) controller transfers data from one address to another without

CPU intervention across the entire address range.

The DMA offers a significant performance boost relieving the CPU from basic data handling allowing more

advanced applications at lower power and using less code.

The DMA controller features include:

•Three independent transfer channels

•Configurable DMA channel priorities

•Requires only two MCLK clock cycles

•Byte or word and mixed byte/word transfer capability

•Block sizes up to 65535 bytes or words

•Configurable transfer trigger selections

•Selectable edge or level-triggered transfer

•Four transfer-addressing modes

•Single, block, or burst-block transfer modes

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