# \#external-clocks

**URL:** https://forums.digi.com/tag/external-clocks/1902.md

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## [hdlc external clocks](https://forums.digi.com/t/hdlc-external-clocks/14230)

<div class="topic-metadata">

**Author:** [@jlrubio](https://forums.digi.com/u/jlrubio)\
**Replies:** 0\
**Last updated:** [January 23, 2015, 8:04am UTC](https://forums.digi.com/t/hdlc-external-clocks/14230 "2015-01-23T08:04:23Z")

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We are trying ti use the serial ports E & F on RCM5700 module for HDLC frames. We can configure the serial ports for internal or external clocks (SECR & SFCR registers bits 3:2). When we use external clock option, are…