# \#rabbit-6000 **URL:** https://forums.digi.com/tag/rabbit-6000/799.md [Latest](https://forums.digi.com/latest.md) · [Categories](https://forums.digi.com/categories.md) · [Tags](https://forums.digi.com/tags.md) --- ## [Which clock needs to be above 12 MHz for the internal RAM of the Rabbit 6000?](https://forums.digi.com/t/which-clock-needs-to-be-above-12-mhz-for-the-internal-ram-of-the-rabbit-6000/37145)
**Author:** [@spth](https://forums.digi.com/u/spth)\ **Replies:** 4\ **Last updated:** [September 9, 2025, 11:05am UTC](https://forums.digi.com/t/which-clock-needs-to-be-above-12-mhz-for-the-internal-ram-of-the-rabbit-6000/37145 "2025-09-09T11:05:41Z")
Apparently the internal RAM needs a clock to be above 12 MHz to avoid data loss. According to section 5.3.1 of the user manual, the main clock needs to be \> 12 MHz, according to section 2.1, the CPU clock needs to be \>= … --- ## [What is the status of the Rabbit 6000 (SY)SCFG pin if there is none?](https://forums.digi.com/t/what-is-the-status-of-the-rabbit-6000-sy-scfg-pin-if-there-is-none/37144)
**Author:** [@spth](https://forums.digi.com/u/spth)\ **Replies:** 1\ **Last updated:** [June 16, 2025, 5:56pm UTC](https://forums.digi.com/t/what-is-the-status-of-the-rabbit-6000-sy-scfg-pin-if-there-is-none/37144 "2025-06-16T17:56:41Z")
According to the Rabbit 6000 User manual, the state of a pin, sometimes called SYSCFG, sometimes called SCFG, affects the operation of the Rabbit 6000 (by potentially overriding the two least-significant bits of MB0CR, a… --- ## [Looking for project engineer experienced with Rabbit chipset](https://forums.digi.com/t/looking-for-project-engineer-experienced-with-rabbit-chipset/29339)
**Author:** [@smarks](https://forums.digi.com/u/smarks)\ **Replies:** 1\ **Last updated:** [January 21, 2024, 3:58pm UTC](https://forums.digi.com/t/looking-for-project-engineer-experienced-with-rabbit-chipset/29339 "2024-01-21T15:58:08Z")
I’m looking to hire a senior engineer who is familiar with the rabbit (specifically using the 6000) chipset. Looking for someone to develop PCBA, F/W, enclosure, the whole package. Anyone interested please send me a… --- ## [How to tell the difference between Rabbit 4000, 5000 and 6000?](https://forums.digi.com/t/how-to-tell-the-difference-between-rabbit-4000-5000-and-6000/21810)
**Author:** [@spth](https://forums.digi.com/u/spth)\ **Replies:** 2\ **Last updated:** [October 1, 2020, 3:07pm UTC](https://forums.digi.com/t/how-to-tell-the-difference-between-rabbit-4000-5000-and-6000/21810 "2020-10-01T15:07:58Z")
The Rabbits have the GCPU and GREV registers. they allow to easily identify Rabbit 2000 and Rabbit 3000 variants (GCPU for the Rabbit 2000 vs. 3000, GCREV for the revision). However, according to the user manuals, the R… --- ## [What is the ROM identifier?](https://forums.digi.com/t/what-is-the-rom-identifier/21824)
**Author:** [@spth](https://forums.digi.com/u/spth)\ **Replies:** 1\ **Last updated:** [October 1, 2020, 11:19am UTC](https://forums.digi.com/t/what-is-the-rom-identifier/21824 "2020-10-01T11:19:27Z")
The Rabbit 3000 and 6000 (but no other Rabbits), according to the user manuals, have a Global ROM Configuration Register (GROM). Unfortunately, the user manual doesn’t really discuss them. In particular, there is a 4-bit… --- ## [Using Serial Port A in regular operation on the RCM6700?](https://forums.digi.com/t/using-serial-port-a-in-regular-operation-on-the-rcm6700/19496)
**Author:** [@nj1](https://forums.digi.com/u/nj1)\ **Replies:** 1\ **Last updated:** [May 14, 2018, 5:58pm UTC](https://forums.digi.com/t/using-serial-port-a-in-regular-operation-on-the-rcm6700/19496 "2018-05-14T17:58:38Z")
Hello, I’m attempting to configure the RCM 6000’s programming port (TX/RX PC6, PC7) for use as a regular serial port. I am using the serial port in the same manner I use all my other serial ports, following the same pro… --- ## [Seeing significant (almost exponential) drops in clock performance with small increases in the amount of instructions](https://forums.digi.com/t/seeing-significant-almost-exponential-drops-in-clock-performance-with-small-increases-in-the-amount-of-instructions/19378)
**Author:** [@nj1](https://forums.digi.com/u/nj1)\ **Replies:** 1\ **Last updated:** [April 9, 2018, 6:31pm UTC](https://forums.digi.com/t/seeing-significant-almost-exponential-drops-in-clock-performance-with-small-increases-in-the-amount-of-instructions/19378 "2018-04-09T18:31:31Z")
Hello, I am programming a Rabbit RCM6700 and have noticed some concerning issues regarding the overall performance. According to the manuals, the Rabbit 6000 processor utilized by the RCM 6700 has a maximum clock speed … --- ## [RCM6650W: What do I need to fix in libraries to get a 512KB or more flash memory program?](https://forums.digi.com/t/rcm6650w-what-do-i-need-to-fix-in-libraries-to-get-a-512kb-or-more-flash-memory-program/18415)
**Author:** [@luisr2d2](https://forums.digi.com/u/luisr2d2)\ **Replies:** 3\ **Last updated:** [June 2, 2017, 1:30pm UTC](https://forums.digi.com/t/rcm6650w-what-do-i-need-to-fix-in-libraries-to-get-a-512kb-or-more-flash-memory-program/18415 "2017-06-02T13:30:22Z")
The Rabbit 6000 User’s Manual says that Library of this family by deafult comes to program flash sizes of 256KB, in RCM6650W: What do I need to fix in libraries to get a 512KB or more flash memory program? I have a larg… --- ## [How to track down unaligned access when using assembly with Dynamic C?](https://forums.digi.com/t/how-to-track-down-unaligned-access-when-using-assembly-with-dynamic-c/18155)
**Author:** [@casey](https://forums.digi.com/u/casey)\ **Replies:** 2\ **Last updated:** [March 24, 2017, 3:36pm UTC](https://forums.digi.com/t/how-to-track-down-unaligned-access-when-using-assembly-with-dynamic-c/18155 "2017-03-24T15:36:24Z")
Quick Version: How (if possible) can I tell if an assembly instruction will access unaligned memory on a Rabbit 6000, and thus correctly determine the number of clocks an ISR will take up. Details: If you look at the c… --- ## [FAT\_SHELL.C Error: Root directory full](https://forums.digi.com/t/fat-shell-c-error-root-directory-full/18140)
**Author:** [@dilbertgod](https://forums.digi.com/u/dilbertgod)\ **Replies:** 1\ **Last updated:** [March 24, 2017, 2:50pm UTC](https://forums.digi.com/t/fat-shell-c-error-root-directory-full/18140 "2017-03-24T14:50:39Z")
I am currently developing on the RCM 6750 with an SD card attached. My goal is to mount a FAT for both the on-board SFLASH as well as the SD card at the same time. However, when running the sample program FAT\_SHELL.C, … --- ## [Overlapping/Pending Interrupts](https://forums.digi.com/t/overlapping-pending-interrupts/17634)
**Author:** [@casey](https://forums.digi.com/u/casey)\ **Replies:** 0\ **Last updated:** [November 1, 2016, 11:51am UTC](https://forums.digi.com/t/overlapping-pending-interrupts/17634 "2016-11-01T11:51:59Z")
I’m trying to determine the behavior of the rabbit 6000 when interrupts of the same level occur simultaneously. I’ve read through the existing documentation, and I’ve encountered the following language: “There is a prio… --- ## [RCM6600W: How to tell when interface is down?](https://forums.digi.com/t/rcm6600w-how-to-tell-when-interface-is-down/16980)
**Author:** [@casey](https://forums.digi.com/u/casey)\ **Replies:** 3\ **Last updated:** [July 14, 2016, 4:56pm UTC](https://forums.digi.com/t/rcm6600w-how-to-tell-when-interface-is-down/16980 "2016-07-14T16:56:45Z")
Working with an RCM6600W. I’m periodically polling ifpending() with the wifi/ethernet interfaces, but even when pulling the ethernet cable from the port, or powering down the connected access point, the status of the int… --- ## [Quadrature Decoder not functioning](https://forums.digi.com/t/quadrature-decoder-not-functioning/16936)
**Author:** [@alexander-ldi](https://forums.digi.com/u/alexander-ldi)\ **Replies:** 1\ **Last updated:** [June 23, 2016, 2:30pm UTC](https://forums.digi.com/t/quadrature-decoder-not-functioning/16936 "2016-06-23T14:30:01Z")
Good day. I am trying to use the Quadrature Decoder on Rabbit 6000 with the RCM6700 kit. For some reason it does not work properly, the value returned (either by qd\_read function or by reading the QDC1R register) is alw… --- ## [waitfor and wfd issues](https://forums.digi.com/t/waitfor-and-wfd-issues/16778)
**Author:** [@alexander-ldi](https://forums.digi.com/u/alexander-ldi)\ **Replies:** 4\ **Last updated:** [June 13, 2016, 8:08am UTC](https://forums.digi.com/t/waitfor-and-wfd-issues/16778 "2016-06-13T08:08:04Z")
I am facing a trouble concerning usage of waitfor and waitfordone in our program, which was initially written for Rabbit 2000, but now being modified to be used at Rabbit 6000. The program utilizes costates. It has seve… --- ## [Where can i find the RABBIT 6000 Instruction set? The documentation provided only lists the rabbit 2000-5000 processors.](https://forums.digi.com/t/where-can-i-find-the-rabbit-6000-instruction-set-the-documentation-provided-only-lists-the-rabbit-2000-5000-processors/12720)
**Author:** [@ascarrul](https://forums.digi.com/u/ascarrul)\ **Replies:** 3\ **Last updated:** [May 5, 2016, 4:49am UTC](https://forums.digi.com/t/where-can-i-find-the-rabbit-6000-instruction-set-the-documentation-provided-only-lists-the-rabbit-2000-5000-processors/12720 "2016-05-05T04:49:48Z")
--- ## [Serial port E in HDLC mode: HDLC CRC is not matching with standard Polynomial](https://forums.digi.com/t/serial-port-e-in-hdlc-mode-hdlc-crc-is-not-matching-with-standard-polynomial/15861)
**Author:** [@Abhi](https://forums.digi.com/u/Abhi)\ **Replies:** 1\ **Last updated:** [January 20, 2016, 3:00pm UTC](https://forums.digi.com/t/serial-port-e-in-hdlc-mode-hdlc-crc-is-not-matching-with-standard-polynomial/15861 "2016-01-20T15:00:38Z")
Hi, We are using Serial port E in HDLC mode(Rabbit 6000) to send the HDLC data out on port E pins with CRC appended. As specified in manual rabiit uses CRC CCITT polynomial x^{16} + x^{12} + x^{5} + 1 with intial cond… --- ## [Is the Rabbit 6000 I/O ring Input 5V tolerant?](https://forums.digi.com/t/is-the-rabbit-6000-i-o-ring-input-5v-tolerant/14610)
**Author:** [@mattfosteraz](https://forums.digi.com/u/mattfosteraz)\ **Replies:** 1\ **Last updated:** [March 27, 2015, 2:47am UTC](https://forums.digi.com/t/is-the-rabbit-6000-i-o-ring-input-5v-tolerant/14610 "2015-03-27T02:47:51Z")
--- ## [Wher can I find examples of the USB host as part if the Rabbit 6000/RCM6700](https://forums.digi.com/t/wher-can-i-find-examples-of-the-usb-host-as-part-if-the-rabbit-6000-rcm6700/11973)
**Author:** [@troy\_takach](https://forums.digi.com/u/troy_takach)\ **Replies:** 3\ **Last updated:** [September 30, 2013, 9:21am UTC](https://forums.digi.com/t/wher-can-i-find-examples-of-the-usb-host-as-part-if-the-rabbit-6000-rcm6700/11973 "2013-09-30T09:21:22Z")
Where can I find information of activating and interfacing to the USB host contained in the Rabbit 6000 processor. I notice that the Functions for USB Host access are now in Dynamic C 10.6x+ I need some example schemati…