The Secure Digital and Multimedia Card Interface allows access to external SD memory cards and provides clock generation, power management control, and command and data transfer. The SD/MMC card interface is supported by the general purpose DMA. These MCUs have a single 10-bit successive approximation ADC with six channels converting at approximately 400 kilo-samples-per-second. There are individual result registers for each ADC channel to reduce interrupt overhead. There is also a 10-bit D/A converter based on a resistor string architecture with buffered output and selectable output drive.