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AM263P4-Q1: Power-up sequence of clock signal

teshima yohei
Prodigy 110 points
Part Number: AM263P4-Q1

Tool/software:

Hi, Team.

I would like to know the clock sequence when powering on.

After powering on, the clock is input (XI if a crystal is used), and then the PoZ reset is released. Are there any timing specifications?

Also, if a crystal is used, is it correct to understand that XO is output from the microcontroller after the reset is released?

Jpanese memo

パワーオン時のクロックのシーケンスを教えてほしい
電源オン後にクロック入力（水晶を使用する場合、XI）、さらにその後PoZリセットが解除になると考えられるが、タイミング規定はあるのか
また水晶を使用している場合、XOはリセット解除後にマイコンから出力される認識でいいか

  • +1
    TI__Guru*** 135135 points

    Hello Yohei-san,

    teshima yohei said:
    After powering on, the clock is input (XI if a crystal is used), and then the PoZ reset is released. Are there any timing specifications?

    No there is not, but if the oscillator is not able to start correctly then the device will typically fail to boot. It may be possible to get the device boot in limp mode but it wouldn't really be able to run a high performing system like that.

    teshima yohei said:
    Also, if a crystal is used, is it correct to understand that XO is output from the microcontroller after the reset is released?

    I am not sure I am fully understanding this question, but if you mean will the MCU I/O for XTAL_XO be functional and work with an active oscillator, then yes it would. It will begin functioning after reset is released and as soon as the crystal starts to input into the MCU.

    Best Regards,

    Ralph Jacobi