Motorola MCU 68HC912D60 Manual do Utilizador descarregar pdf (Página 12)

12 68HC912D60MSE4 Rev 2

March 14, 2001

Figure 2. Representation of unreliable start-up mode with slow crystal

Figure 3. Representation of preferred means of overcoming issue with Figure 2

Power ON

13-bit WCR

counter

Ext Reset pin

Osc. Extal

LH mode

sysclock

4096

count

point

PLL clock

Unstable clock

Power ON

13-bit WCR

counter

Ext Reset pin

Osc. Extal

LH mode

sysclock

4096

count

point

PLL clock

EXTAL derived clock

Code runs from here –

clock is stable.

1 2 ... 7 8 9 10 11 12 13

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