ATMEGA640 datasheet(359/436 Pages) MICROCHIP

Part #	ATMEGA640

Description	8-bit Microcontroller with 16/32/64KB In-System Programmable Flash

PDF	436 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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359

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

31.3 Clock Characteristics

31.3.1

Calibrated Internal RC Oscillator Accuracy

Notes: 1. Voltage range for ATmega640V/1281V/1280V/2561V/2560V.

2. Voltage range for ATmega640/1281/1280/2561/2560.

31.3.2

External Clock Drive Waveforms

Figure 31-5. External Clock Drive Waveforms

31.4 External Clock Drive

Table 31-1.

Calibration Accuracy of Internal RC Oscillator

Frequency

VCC

Temperature

Calibration Accuracy

Factory Calibration

8.0MHz

C±10%

User Calibration

7.3MHz - 8.1MHz

1.8V - 5.5V(1)

2.7V - 5.5V(2)

-40

C - 85C±1%

VIL1

VIH1

Table 31-2.

External Clock Drive

Symbol

Parameter

VCC = 1.8V - 5.5V

VCC = 2.7V - 5.5V

VCC = 4.5V - 5.5V

Units

Min.

Max.

Min.

Max.

Min.

Max.

1/tCLCL

Oscillator Frequency

MHz

tCLCL

Clock Period

500

125

62.5

tCHCX

High Time

200

tCLCX

Low Time

200

tCLCH

Rise Time

2.0

1.6

0.5

s

tCHCL

Fall Time

2.0

1.6

0.5

t

CLCL

Change in period from one

clock cycle to the next

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