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What do you mean by Caution on system clock after boot (Clock)?

Latest Updated:02/01/2006

Question:

Caution on system clock after boot (Clock)

Answer:

(Described in uPD77210 Family User's Manual (2nd edition))

Although the CLKIN direct clock is used as the system clock when reset is active at startup, the following clock is selected in the boot process.

  • PLL output clock (except for external memory boot or non-boot)
  • CLKIN direct clock (for external memory boot or non-boot)
  • Divider: Divider operation (1/1), divider output clock is not selected
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