AT90PWM2 datasheet(163/365 Pages) ATMEL

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163

AT90PWM2/3

4317A-3–AVR–02/05

PSC2 Outputs

Output Matrix

PSC2 has an output matrix which allow in 4 ramp mode to program a value of

PSCOUT20 and PSCOUT21 binary value for each ramp.

PSCOUT2m takes the value given in Table 59. during all corresponding ramp. Thanks

to the Output Matrix it is possible to generate all kind of PSCOUT20/PSCOUT21

combination.

When Output Matrix is used, the PSC n Output Polarity POPn has no action on the

outputs.

PSCOUT22 & PSCOUT23

Selectors

PSC 2 has two supplementary outputs PSCOUT22 and PSCOUT23.

According to POS22 and POS23 bits in PSOC2 register, PSCOUT22 and PSCOUT23

duplicate PSCOUT20 and PSCOU21.

If POS22 bit in PSOC2 register is clear, PSCOUT22 duplicates PSCOUT20.

If POS22 bit in PSOC2 register is set, PSCOUT22 duplicates PSCOUT21.

If POS23 bit in PSOC2 register is clear, PSCOUT23 duplicates PSCOUT21.

If POS23 bit in PSOC2 register is set, PSCOUT23 duplicates PSCOUT20.

Figure 91. PSCOUT22 and PSCOUT23 Outptuts

PSC Synchronization

2 or 3 PSC can be synchronized together. In this case, two waveform alignments are

possible:

•

The waveforms are center aligned in the Center Aligned mode if master and slaves

are all with the same PSC period (which is the natural use).

•

The waveforms are edge aligned in the 1, 2 or 4 ramp mode

Table 59. Output Matrix versus ramp number

Ramp 0Ramp 1Ramp 2Ramp 3

PSCOUT20

POMV2A0

POMV2A1

POMV2A2

POMV2A3

PSCOUT21

POMV2B0

POMV2B1

POMV2B2

POMV2B3

PSCOUT20

PSCOUT21

Waveform

Generator A

Waveform

Generator B

PSCOUT22

PSCOUT23

POS22

POS23

Output

Matrix

AT90PWM2 Datasheet(PDF) 163 Page - ATMEL Corporation

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