Cirrus Logic AN186 - Manual (Page 9)

AN186
AN186REV1 9
8.2 Timing Diagrams for the Case of Wakeup from Standby State
A. External OSC(13Mhz) with “CLKEN” on “RUN/CLKEN” pin
Note: In Figure 4 , the system assumes that the CLKEN pin enables the external oscillator.
B. External OSC (13 MHz) with “RUN” on “RUN/CLKEN” Pin
Note: In Figure 5 , the system assumes that the OSC is permanently enabled.
Internal RUN
Instruction fetches
WAKEUP (input)
OSC
Stable clock
CLKEN (output)
( 62-125us )
( 125-250ms )
Figure 4. Timing Diagram, External OSC(13 MHz) with “CLKEN” on ‘”RUN/CLKEN” Pin
RUN (output)
Instruction fetches
WAKEUP (input)
OSC
( 62-125us )
Figure 5. Timing Diagram, External OSC (13 MHz) with “RUN” on “RUN/CLKEN” Pin