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CCS/HERCULES_SAFETY_MCU_DEMOS: RM46L852PGE, CC1201

nguyen quan
Intellectual 280 points

Part Number: HERCULES_SAFETY_MCU_DEMOS

Tool/software: Code Composer Studio

Hi EveryOne

I use RM46L852 to communicate with CC1201, by SPI.

As i know, i can use speed 7.7Mhz to access CC1201 register, I did it quite well only one thing, sometime RM46L852 can not transfer Tx command to CC1201 with speed 7.7Mhz correctly.

This Tx Command  works well with SPI speed 1Mhz.

I  changed SPI delay on HALCOGEN over CC1201 require, but somtime it not work.

Do i have to pull up SPI line  to Vcc by resistor, or do something else?

Thanks for your time.

  • 0
    TI__Guru 72500 points
    No, the SPI output is push-pull and does not normally need a pull-up. However, depending on the length of the signal traces, at that frequency the traces act as a transmission line. You may need to properly terminate to avoid reflections particularly on the SPICLK signal. If there is too much capacitance in the net, then you may need to operate at lower speeds.