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ATSAM4S-XPLD
1106
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
46.2.2 Flash
46.2.2.1 Flash: Read Error after a GPNVM or Lock Bit Writing
The sequence below leads to a bad read value.
Fail sequence is:
Read Flash @ address XXX
Programming Flash: Write GPNVM or Lock Bit instructions
Read Flash @ address XXX
Problem Fix/Workaround
A dummy read at another address needs to be included in the sequence.
Sequence is:
Read Flash @ address XXX
Programming Flash: Write GPNVM or Lock Bit instructions
Read Flash @ address YYY (dummy read)
Read Flash @ address XXX
46.2.3 Watchdog
46.2.3.1 Watchdog Not Stopped in Wait Mode
When the Watchdog is enabled and the bit WAITMODE = 1 is used to enter wait mode, the watchdog is not halted. If the
time spent in Wait Mode is longer than the Watchdog time-out, the device will be reset if Watchdog reset is enabled.
time spent in Wait Mode is longer than the Watchdog time-out, the device will be reset if Watchdog reset is enabled.
Problem Fix/Workaround
When entering wait mode, the Wait For Event (WFE) instruction of the processor Cortex-M4 must be used with the
SLEEPDEEP of the System Control Register (SCB_SCR) of the Cortex-M = 0.
SLEEPDEEP of the System Control Register (SCB_SCR) of the Cortex-M = 0.
46.2.4 Brownout Detector
46.2.4.1 Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected
In active mode or in wait mode, if the Brownout Detector is disabled (SUPC_MR: BODDIS=1) and power is lost on
VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably.
VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably.
Problem Fix/Workaround
When the Brownout Detector is disabled in active or in wait mode, VDDCORE always needs to be powered.