Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Data Sheet
Product codes
ATSAM4E-EK
555
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
28.13.2 Switching from (to) Slow Clock Mode to (from) Normal Mode
When switching from slow clock mode to the normal mode, the current slow clock mode transfer is completed at
high clock rate, with the set of slow clock mode parameters.See
high clock rate, with the set of slow clock mode parameters.See
. The external device
may not be fast enough to support such timings.
illustrates the recommended procedure to properly switch from one mode to the other.
Figure 28-29. Clock Rate Transition Occurs while the SMC is Performing a Write Operation
Figure 28-30. Recommended Procedure to Switch from Slow Clock Mode to Normal Mode or from Normal Mode to Slow Clock
Mode
A[23:0]
NCS
1
MCK
NWE
1
1
NWE_CYCLE = 3
SLOW CLOCK MODE WRITE
Slow Clock Mode
internal signal from PMC
1
1
1
2
3
2
NWE_CYCLE = 7
NORMAL MODE WRITE
Slow clock mode
transition is detected:
Reload Configuration Wait State
This write cycle finishes with the slow clock mode set
of parameters after the clock rate transition
SLOW CLOCK MODE WRITE
A[23:0]
NCS
1
MCK
NWE
1
1
SLOW CLOCK MODE WRITE
Slow Clock Mode
internal signal from PMC
2
3
2
NORMAL MODE WRITE
IDLE STATE
Reload Configuration
Wait State