AT90PWM2 datasheet(157/361 Pages) ATMEL

157 / 361 page

157

4317J–AVR–08/10

AT90PWM2/3/2B/3B

16.19 PSC2 Outputs

16.19.1

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 16-8. 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.

16.19.2

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 16-37. PSCOUT22 and PSCOUT23 Outptuts

16.20 Analog Synchronization

PSC generates a signal to synchronize the sample and hold; synchronisation is mandatory for

measurements.

Table 16-8.

Output Matrix versus ramp number

Ramp 0

Ramp 1

Ramp 2

Ramp 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

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