AT90SCR100 datasheet(125/433 Pages) ATMEL

Part #	AT90SCR100

Description	8-bit Microcontroller for Smart Card Readers

PDF	433 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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125 / 433 page

125

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 13-22.

Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (fclk_I/O/8)

Figure 13-23 shows the count sequence close to TOP in various modes. When using phase and

frequency correct PWM mode the OCR1x Register is updated at BOTTOM. The timing diagrams

will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.

The same renaming applies for modes that set the TOV1 Flag at BOTTOM.

Figure 13-23.

Timer/Counter Timing Diagram, no Prescaling

Figure 13-24 shows the same timing data, but with the prescaler enabled.

OCF1x

OCR1x

TCNT1

OCR1x Value

OCR1x - 1

OCR1x

OCR1x + 1

OCR1x + 2

clk

I/O

clk

(clk

I/O /8)

TOV1(FPWM)

and ICF1(if used

as TOP)

OCR1x

(Update at TOP)

TCNT1

(CTC and FPWM)

TCNT1

(PC and PFC PWM)

TOP - 1

TOP

TOP - 1

TOP - 2

Old OCR1x Value

New OCR1x Value

TOP - 1

TOP

BOTTOM

BOTTOM + 1

clk

(clk

I/O /1)

clk

I/O

AT90SCR100 Datasheet(PDF) 125 Page - ATMEL Corporation

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