# Way of SL808x digital audio I/O less taxing than 2MHz PCM?

**URL:** https://forum.sierrawireless.com/t/way-of-sl808x-digital-audio-i-o-less-taxing-than-2mhz-pcm/8064
**Category:** Legacy AirPrime modules
**Created:** [July 17, 2015, 1:10pm UTC](https://forum.sierrawireless.com/t/way-of-sl808x-digital-audio-i-o-less-taxing-than-2mhz-pcm/8064 "2015-07-17T13:10:44Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rqc](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/rqc/32/1524_2.png) [@rqc](https://forum.sierrawireless.com/u/rqc)
#### Post date: [July 17, 2015, 1:10pm UTC](https://forum.sierrawireless.com/t/way-of-sl808x-digital-audio-i-o-less-taxing-than-2mhz-pcm/8064/1 "2015-07-17T13:10:44Z")

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I need to exchange digital audio with Sierra Wireless SL808X from my microcontroller CPU. SL808X chips only seem to support 2MHz PCM which is very taxing on CPU. I only need to transfer voice, 128MHz sampling rate is a complete overkill. Isn’t there a way to input and output audio with lower sampling rate, via PCM pins, UART or whatever?