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ULINK: JTAG PULL-UP RESISTORS
Information in this article applies to:
- ULINK - All Versions
- ULINK2 - All Versions
QUESTION
The ULINK and ULINK2 User's Guides recommend using 100K pull-up resistors for JTAG signals TMS, TDI, TRST, and TCLK. But the Keil MCB2300 Evaluation Board uses 10K pull-up resistors, not 100K for those signals.
Which one is correct?
ANSWER
You may use either 10K or 100K resistors (or any value in between) as pull-ups for these JTAG signals. What's important is that you use them so they will keep the JTAG signals from floating when they are not connected to anything.
MORE INFORMATION
- Refer to Target Connectors in the ULINK® User's Guide.
- Refer to Target Connectors in the ULINK®2 User's Guide.
Last Reviewed: Monday, July 02, 2007
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