1.1.7 Timer/Counter Inputs (TC and ALTTC)
The TC waveform output WO[0] can be used as input source. A
total of two TCs can be applied as inputs to one LUT, default and alternative TC. TC waveform
input is selected by writing the Input y Source Selection bit group in the LUT Control x
register (LUTCTRLx.INSELy) to 0x6 or 0x7. For LUTx, TCx and the subsequent TC(x+1) instances
are available as default and alternative TC selections. The corresponding LUTs and input TCs
are indicated in the following table. Before selecting the TC waveform output, the TC must be
configured.
| LUT | IN[x] | TC | ALTTC |
|---|---|---|---|
| LUT0 | x = 0,1,2 | TC0 | TC1 |
| LUT1 | x = 0,1,2 | TC1 | TC2 |
| LUT2 | x = 0,1,2 | TC2 | TC3 |
| LUT3 | x = 0,1,2 | TC3 | TC4 |
Note: The following errata applies to
Rev. A devices of SAM
L21.
The default TC selection is TC4/TC0/TC1/TC2 instead of TC0/TC1/TC2/TC3, and the alternate TC
selection is TC0/TC1/TC2/TC3 instead of TC1/TC2/ TC3/ TC4. Errata reference:
13406.