AT90PWM2 datasheet(214/361 Pages) ATMEL

部品番号	AT90PWM2

部品情報	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	361 Pages

Scroll/Zoom	100%

メーカー	ATMEL [ATMEL Corporation]

ホームページ	http://www.atmel.com

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214 / 361 page

214

4317J–AVR–08/10

AT90PWM2/3/2B/3B

The maximum counter value is given by the following formula:

MUBRR[H:L]=F

CLKIO / (baud rate frequency)

MBURR[H:L] is used to calibrate the detect window of the start bit and to detect time overflow of

the other bits.

19.3.4

Double Speed Operation (U2X)

Double Speed Operation is controlled by U2X bit in UCSRA. See “Double Speed Operation

(U2X)” on page 186.

This mode of operation is not allowed in manchester bit coding.

Each ‘bit time’ in the Manchester serial frame is divided into two phases (See Figure 19-4). The

counter counts during the first phase and counts down during the second one. When the data bit

transition is detected, the counter memorises the N1 counter value and start counting down.

When the counter reaches the zero value, it starts counting up again and the N1/2 value allows

to open the next detection window. This detection window defines the time zone where the next

data bit edge is sampled.

AT90PWM2 データシート(PDF) 214 Page - ATMEL Corporation