# Is there any pin for CLOCK  in RCM4000 - 50 pin header module?

**URL:** <https://forums.digi.com/t/is-there-any-pin-for-clock-in-rcm4000-50-pin-header-module/13378>\
**Category:** Rabbit Software\
**Tags:** clock, data, rcm4000\
**Created:** [July 29, 2014, 8:57am UTC](https://forums.digi.com/t/is-there-any-pin-for-clock-in-rcm4000-50-pin-header-module/13378 "2014-07-29T08:57:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![AISWARYA\_RAJ](https://avatars.discourse-cdn.com/v4/letter/a/e9bcb4/32.png) [@AISWARYA\_RAJ](https://forums.digi.com/u/AISWARYA_RAJ)\
**Post date:** [July 29, 2014, 8:57am UTC](https://forums.digi.com/t/is-there-any-pin-for-clock-in-rcm4000-50-pin-header-module/13378/1 "2014-07-29T08:57:49Z")

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Which is the clock pin used for slave-master communication where the schematic shows hardware connection between CLK-XTALB1 ?

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**Author:** ![MargaretK](https://avatars.discourse-cdn.com/v4/letter/m/d9b06d/32.png) [@MargaretK](https://forums.digi.com/u/MargaretK)\
**Post date:** [July 29, 2014, 3:40pm UTC](https://forums.digi.com/t/is-there-any-pin-for-clock-in-rcm4000-50-pin-header-module/13378/2 "2014-07-29T15:40:07Z")

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What is XTALB1?

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**Author:** ![AISWARYA\_RAJ](https://avatars.discourse-cdn.com/v4/letter/a/e9bcb4/32.png) [@AISWARYA\_RAJ](https://forums.digi.com/u/AISWARYA_RAJ)\
**Post date:** [July 29, 2014, 11:07pm UTC](https://forums.digi.com/t/is-there-any-pin-for-clock-in-rcm4000-50-pin-header-module/13378/3 "2014-07-29T23:07:40Z")

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It is mentioned in the hardware interfacing schematic diagram(fig.18-1) in chapter-18-Slave Port in Rabbit 4000 Microprocessor User’s Manual