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ʹءѺ AVR ͹ : Set Fuse Bit ͡˹Դͧ Oscillator 㹵 AVR ԵԹѹ

All Articles >> C for Microcontroller >> - ʹءѺ AVR ͹ : Set Fuse Bit ͡˹Դͧ Oscillator 㹵 AVR ԵԹѹ

ӹ
·ҹҹ AVR ԴѺʹ Ҩ Set Fuse Bit ˹ Oscillator Type ҧ١ͧ ҡ Set ԴҨз AVR Lock (ѧ¹ФѺ) ӧҹͧ ͹ػԸա Set Fuse ҹҹ йҹҧ١ͧ

 

Һ
AVR Fuse Bit ˹ҷ˹ Oscillator Type С˹ҷǢͧ մ¡ѹ 7 Bit

CKOPT
Է͡ǧ Internal Capacitor ǧ Oscillator ¨е͢ XTAL1
XTAL2 ŧ GND

CKSEL3, CKSEL2, CKSEL1, CKSEL0
4 Է͡Դ Ъǧ ͧ Oscillator Դҧ · CKSEL0
ѹѺ SUT

SUT1, SUT0
2 Է˹ҷ˹ Start-Up Time

ҷӤ㨤ѾѹѡԴ

Start UP Time (SUT)

ǧҺҵ §ǧ MCU ֧ MCU зӧҹá ҡҵͧ MCU ʶҾ÷ӧҹ蹤 Ҥá˹ժǧ SUT ҹҹ ǧ Oscillator Ҿͷ зӧҹ餧͹ MCU зӧҹ AVR ö͡ Hardware MCU繵ǡ˹Start UP Time ¤ҷʴ㹵ҧ繨ӹǹ١ͧ System Clock к͡ ¡͡ AVR Fusebit ժ SUT1 SUT0 ´СǶ֧㹪ǧ

Additional Dealy from Reset ( RS-Delay)
ǧҺҷ鹵 MCU ١ Reset  ֧ӧҹá   AVR ö͡ Hardware MCU繵ǡ˹ ͡ 2 ҪǧҤ 4.1 mS 65 mS ҡ͡ Fuse Bit SUT1, SUT0

ҵŧѹ͹ ֧Է Է ҧ çҨšԴ ػẺФѺ

Է (Programmed ) = 0
Է (Unprogrammed) = 1

AVR ͡ҡçҹԵ ҫ
Fuse Bit ж١ SET CKOPT=1 CKSEL=0001 SUT=10
蹤 ж١ SET internal RC 1MHz SUT = 6 clock RS-Delay = 65 mS

ӺԷ 7 ¹ػҧѹ ѧѺ

1)Crystal (High Frequency)


2)Crystal Oscillator (Low Frequency)

3)Extenal RC Oscillator

4) Internal RC Oscillator

5)External Clock

Ҵٵҧ SET ¡˹ҵҧ Configuration and Security bits ͧ Ponyprog2000 繵ҧ set ФԴѺ AVR 㹻¹ФѺ ͺᴧ Է 7 Ǣͧ

ҧ Set Fuse Bit

Ex1 XTAL 12 MHz, SUT = 16K, RS-Delay = 65 mS

٤Ҩҡҧҹ

Ҩеͧ SET Fuse Bit (¶֧੾ǹ OSC ) ͧ Ponyprog 2000 ѧ :

Ex2 XTAL 3.579 MHz, SUT = 1K, RS-Delay = 65

٤Ҩҡҧҹ

Ҩеͧ SET Fuse Bit (¶֧੾ǹ OSC ) ͧ Ponyprog 2000 ѧ :

Ex3 Ext. RC = 10 MHz, SUT = 8, RS-Delay = 65 mS

ͧ C1 = 20 pF
ҤӹdzҤҢͧ R1= 1,600 Ohm ͡ҷբ¤ 1.5 KOhm
٤Ҩҡҧҹ

Ҩеͧ SET Fuse Bit (¶֧੾ǹ OSC ) ͧ Ponyprog 2000 ѧ :

ػ
Ҷ֧÷Ѵ ѧҷҹҹö Set OSC Fuse Bit ҧ١ͧѹǹФѺ 㹵͹仼¹֧ѭ óշ AVR Lock set fuse Դ зҧ AVR ǹ鹡Ѻҹ