ATmega328P datasheet(317/448 Pages) ATMEL

tên linh kiện	ATmega328P

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash

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317

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

28.4

Clock Characteristics

28.4.1

Calibrated Internal RC Oscillator Accuracy

28.4.2

External Clock Drive Waveforms

Figure 28-2. External Clock Drive Waveforms

28.4.3

External Clock Drive

Note:

All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrollers

manufactured in the same process technology. These values are preliminary values representing design targets, and will be

updated after characterization of actual silicon.

Table 28-1.

Calibration Accuracy of Internal RC Oscillator

Frequency

Temperature

Calibration Accuracy

Factory

Calibration

8.0 MHz

°C±10%

User

Calibration

7.3 - 8.1 MHz

1.8V - 5.5V

-40

°C - 85°C±1%

VIL1

VIH1

Table 28-2.

External Clock Drive

Symbol

Parameter

VCC= 1.8 - 5.5V

VCC= 2.7 - 5.5V

VCC= 4.5 - 5.5V

Units

Min.

Max.

Min.

Max.

Min.

Max.

1/tCLCL

Oscillator Frequency

MHz

tCLCL

Clock Period

250

100

tCHCX

High Time

100

tCLCX

Low Time

100

tCLCH

Rise Time

2.0

1.6

0.5

μs

tCHCL

Fall Time

2.0

1.6

0.5

μs

Δt

CLCL

Change in period from

one clock cycle to the

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