ATmega328P datasheet(307/345 Pages) ATMEL

tên linh kiện	ATmega328P

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

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307

7810A–AVR–11/09

ATmega328P [Preliminary]

28.5

Clock Characteristics

28.5.1

Calibrated Internal RC Oscillator Accuracy

28.5.2

Watchdog Oscillator Accuracy

28.5.3

External Clock Drive Waveforms

Figure 28-2. External Clock Drive Waveforms

28.5.4

External Clock Drive

Note:

All DC/AC characteristics contained in this datasheet are based on characterization of ATmega328P AVR microcontroller man-

ufactured in an automotive process technology.

Table 28-1.

Calibration Accuracy of Internal RC Oscillator

Frequency

VCC

Temperature

Calibration Accuracy

Factory

Calibration

8.0 MHz

25°C

±2%

2.7V - 5.5V

-40°C - 125°C

±14%

Table 28-2.

Accuracy of Watchdog Oscillator

Symbol

Parameter

Condition

Min

Typ

Max

Units

Fwdt

Watchdog oscillator frequency

Vcc = 2.7 - 5.5v

128

180

KHz

VIL1

VIH1

Table 28-3.

External Clock Drive

Symbol

Parameter

VCC=2.7-5.5V

VCC=4.5-5.5V

Units

Min.

Max.

Min.

Max.

1/tCLCL

Oscillator Frequency

MHz

tCHCX

High Time

tCLCX

Low Time

tCLCH

Rise Time

1.6

0.5

tCHCL

Fall Time

1.6

0.5

Δt

CLCL

Change in period from one clock

cycle to the next

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