# RCM3700, HDLC clock

**URL:** <https://forums.digi.com/t/rcm3700-hdlc-clock/9422>\
**Category:** Rabbit\
**Created:** [August 21, 2010, 3:41pm UTC](https://forums.digi.com/t/rcm3700-hdlc-clock/9422 "2010-08-21T15:41:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![il18](https://avatars.discourse-cdn.com/v4/letter/i/90ced4/32.png) [@il18](https://forums.digi.com/u/il18)\
**Post date:** [August 21, 2010, 3:41pm UTC](https://forums.digi.com/t/rcm3700-hdlc-clock/9422/1 "2010-08-21T15:41:27Z")

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hi all,

sorry I post twice, I need urgent help.

Using RCM3700 board. I try to use HDLC on Port E and output the clock on TCLKE or PG4. Data appears on TXE but clock don’t.

I tried WrPortI(PGFR, &PGFRShadow, 0xFF) after Open() but nothing.  
I also tried  
BitWrPortI(SECR, &SECRShadow, 1, 4);  
BitWrPortI(SECR, &SECRShadow, 1, 3);  
BitWrPortI(SECR, &SECRShadow, 1, 2);

Any idea? Nothing appears on TXCLOCK or RXCLOCK !

10x