3-2. 입출력 포트 (I/O Port) - realsys.co.kr

4 . 3 . ATmega128 realsys . 3-2. (I/O Port). 3-2. (I/O Port). Atmega128 53 (PortA, PortB, PortC, PortD, PortE, PortF) .. (1). A (Port A). Pull-up 8 2 (PORTA, DDRA) 1 . (PINA) . A (Alternative) RAM I/O (MCUCR . SRE(SRAM Enable)=1) / (AD0 ~ AD7) . A 20mA sink LED . z Port A (PORTA). (DDRA DDAn=1) : A . 0 = Low , 1 = High . (DDRA DDAn=0) : Pull-up . 0= No Pull-up ( 3-state(HI-Z) ), 1=Pull-up . z Port A (DDRA). A . 0 = , 1 = . z Port A (PINA). 349. 4 . 3 . ATmega128 realsys . 3-2. (I/O Port). PINA . PORTA A , PINA .. A DDAn : DDAn PORTAn I/O Pull-up Comment 0 0 NO 3-state(Hi-Z). 0 1 YES Low . 1 0 NO 0 . 1 1 NO 1 . Port : A (Alternative) address data low byte .. 350. 4 . 3 . ATmega128 realsys . 3-2. (I/O Port). (2). B (Port B). B 8 . ( A .). z Port B (PORTB). z Port B (DDRB). z Port B (PINB). B (Alternative) , , DDRB PORTB.

제4부. 제3장. ATmega128 RealSYS 3-2. 입출력 포트 (I/O Port) www.realsys.co.kr 350 PINA는 레지스터가 아닌 입력 핀의 상태를 읽는데 사용한다.

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