AT90PWM2 datasheet(162/365 Pages) ATMEL

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162

AT90PWM2/3

4317A-3–AVR–02/05

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..

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.

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 cap-

ture will be incorrect.

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

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

relatively high priority, the maximum interrupt response time is dependent on the maxi-

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

Table 58. 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

AT90PWM2 Datasheet(PDF) 162 Page - ATMEL Corporation

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