AT90PWM2 datasheet(138/365 Pages) ATMEL

Part #	AT90PWM2

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	365 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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138 / 365 page

138

AT90PWM2/3

4317A-3–AVR–02/05

Running Mode Description

Waveforms and length of output signals are determined by Time Parameters (DT0,

OT0, DT1, OT1) and by the running mode. Four modes are possible :

–

Four Ramp mode

–

Two Ramp mode

–

One Ramp mode

–

Center Aligned mode

Four Ramp Mode

In Four Ramp mode, each time in a cycle has its own definition

Figure 60. PSCn0 & PSCn1 Basic Waveforms in Four Ramp mode

The input clock of PSC is given by CLKPSC.

PSCOUTn0 and PSCOUTn1 signals are defined by On-Time 0, Dead-Time 0, On-Time

1 and Dead-Time 1 values with :

On-Time 0 = OCRnRAH/L * 1/Fclkpsc

On-Time 1 = OCRnRBH/L * 1/Fclkpsc

Dead-Time 0 = (OCRnSAH/L + 2) * 1/Fclkpsc

Dead-Time 1 = (OCRnSBH/L + 2) * 1/Fclkpsc

Note:

Minimal value for Dead-Time 0 and Dead-Time 1 = 2 * 1/Fclkpsc

On-Time 0

On-Time 1

PSCOUTn0

PSCOUTn1

Dead-Time 1

Dead-Time 0

PSC Cycle

OCRnRB

OCRnSB

OCRnRA

OCRnSA

PSC Counter

AT90PWM2 Datasheet(PDF) 138 Page - ATMEL Corporation