AT90PWM3 datasheet(156/361 Pages) ATMEL

156 / 361 page

156

4317J–AVR–08/10

AT90PWM2/3/2B/3B

16.18.1

Available Input Mode according to Running Mode

Some Input Modes are not consistent with some Running Modes. So the table below gives the

input modes which are valid according to running modes..

16.18.2

Event Capture

The PSC can capture the value of time (PSC counter) when a retrigger event or fault event

occurs on PSC inputs. This value can be read by sofware in PICRnH/L register.

16.18.3

Using the Input Capture Unit

The main challenge when using the Input Capture unit is to assign enough processor capacity

for handling the incoming events. The time between two events is critical. If the processor has

not read the captured value in the PICRn Register before the next event occurs, the PICRn will

be overwritten with a new value. In this case the result of the capture will be incorrect.

When using the Input Capture interrupt, the PICRn Register should be read as early in the inter-

rupt handler routine as possible. Even though the Input Capture interrupt has relatively high

priority, the maximum interrupt response time is dependent on the maximum number of clock

cycles it takes to handle any of the other interrupt requests.

Table 16-7.

Available Input Modes according to Running Modes

Input Mode

Number :

1 Ramp Mode

2 Ramp Mode

4 Ramp Mode

Centered Mode

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

Valid

Do not use

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