Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
878
36.6.16 Fault Mode
At any time, the TC_RCx registers can be used to perform a comparison on the respective current channel counter
value (TC_CVx) with the value of TC_RCx register.
The CPCSx flags can be set accordingly and an interrupt can be generated.
This interrupt is processed but requires an unpredictable amount of time to be achieve the required action.
It is possible to trigger the FAULT output of the TIMER1 with CPCS from TC_SR0 and/or CPCS from TC_SR1.
Each source can be independently enabled/disabled in the TC_FMR.
This can be useful to detect an overflow on speed and/or position when QDEC is processed and to act
immediately by using the FAULT output.
Figure 36-21. Fault Output Generation
36.6.17 Register Write Protection
To prevent any single software error from corrupting TC behavior, certain registers in the address space can be
write-protected by setting the WPEN bit in the TC Write Protection Mode Register (TC_WPMR).
The Timer Counter clock of the first channel must be enabled to access TC_WPMR.
TC_SR0 flag CPCS
TC_FMR / ENCF0
FAULT (to PWM input)
OR
AND
AND
TC_SR1 flag CPCS
TC_FMR / ENCF1
The following registers can be write-protected:
 TC Block Mode Register
 TC Channel Mode Register: Capture Mode
 TC Channel Mode Register: Waveform Mode
 TC Fault Mode Register
 TC Stepper Motor Mode Register
 TC Register A
 TC Register B
 TC Register C