SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1451

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

48.2.1.3
48.2.1.4
48.2.2
48.2.2.1
48.2.2.2
48.2.3
48.2.3.1
11057A–ATARM–17-Feb-12
Backup mode
Pulse Width Modulation (PWM)
Flash: Boot Flash Programming Mapping is wrong
Flash: Flash Programming
Backup mode: the PIO states are not kept
PWM: Write protection with PIO lock feature not usable
Backup Mode: VDDIO/VDDANA
GPNVM2 enables to select if Flash0 or Flash1 is used for the boot. But when GPNVM2 is set,
only the first 64 KBytes of the Flash 1 are seen in the Boot Memory. The rest of the Boot mem-
ory corresponds to Flash 0 content.
No fix required if the code size is less than 64Kbytes. Otherwise the software needs to take into
account this limitation if GPNVM2 is used.
When writing data into the Flash memory plane (either through the EEFC, using the IAP function
or FFPI), the data may not be correctly written (i.e the data written is not the one expected).
Set the number of Wait States (WS) at 6 (FWS = 6) during the programming.
When entering in Backup mode , the PIO states are not kept. All the PIOs go into input with pull-
up state in Backup mode.
The issue is of course only present when VDDIO is still supplied in Backup mode. If the VDDIO
is required in this low power mode, either adapt the hardware so that the input with pull-up state
is taken into account in the schematics or use Wait mode instead.
There is an overcurrent consumption in Backup mode on VDDIO and/or VDDANA when VDDIO
and/or VDDANA are supplied.
Two workarounds are possible:
1) Do not supply VDDANA and VDDIO in backup (by using a switch controlled by SHDN pin for
example)
2) Use Wait mode instead of Backup Mode.
Write protection mode with PIO lock (WPCMD=2) can not be used . In this case, the PWM out-
puts will not be locked but other PIOs will be locked instead
Use Write protect mode without locking the PIO (WPCMD = 1)
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
SAM3X/A
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