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AM3358: Generate a 32.768 KHz clock from processor at a GPIO

Twinkle Goyal
Prodigy 80 points
Part Number: AM3358

Hello,

We are trying to interface a WiFi module with AM3358 processor on our custom board.

The WiFi module requires a clock of 32.768KHz.

Is it possible to derive this clock from SYS_CLK which is 24MHz? If yes, please let me know how.

I tried to look at the CTT tool but was not able to draw any conclusions.

Thanks and Regards,

Twinkle

  • +1
    TI__Guru 62855 points

    AM335x has two internal 32.768KHz clock sources.

    The first is named CLK_32KHZ. This source originates from a fractional divider sourced from the peripheral PLL. There is no way to route this clock to any of the device pins.

    The second is an optional clock named CLK_32K_RTC. This source originates from the 32K crystal oscillator (OSC1) and has the option of being routed to the CLKOUT2 signal which can be multiplexed to the device XDMA_EVENT_INTR1 pin.

    Note: OSC1 has been problematic for some products. It may be easy for noise to couple into the crystal circuit and generate glitches on OSC1's clock output as the slow changing crystal signal crosses the threshold of the input buffer.

    Regards,
    Paul