Timer Couter, TC1, TIM1_COMPC, ATmega128, AVR - 0309

 

 Timer Couter, TC1, TIM1_COMPC

[ 간략 설명 ]

◈ Timer Couter, T/C1, TIM1_COMPC, ATmega128, AVR

◈ 이론부분은 ATmega128 Datasheet 보시라!

ATmega128_p386.txt

[ CPU ]

Flash Memory 128KB ( 64KB + 64KB )

RAM Page Z Select Registor : 두개의 램을 사용 조절 ( 페이지 처럼 )

 

명령어 처리 16bit  /HW : 32bit

메모리 주소: 0 ~ 7FFF  / 8000 ~ FFFF 사용

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Timer Couter, T/C1, TIM1_COMPC
내용 넣기~~~~

 

 
◆◆ ATmega128 , Timer Couter,TIM1_COMPC  P.244 ◆◆

0309A_TimerCounter_p244.c

0309A_TimerCounter_p244.hex

0309A_TimerCounter_p244.prj

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/*
               TimerCounter     T/C 1  > 출력비교 매치 (일반모드)    P.244
               T/C > OCR1C : 0.5sec - 출력비교인터럽트 발생
               interrupt > OC1C(pin17) > PWM 출력 반전 > 0.5sec PWM LED on/off
               OC1 핀의 출력 = 1/16(us) * 1024(분주) * 7812(OCR1) = 499.968(ms) = 0.5sec
               0309A_TimerCounter_p244.c
*/           

#include <mega128.h>

void main(void)
{
                  DDRB = 0xff;                                           // OC1C (PB7) 핀 출력방향설정
                  ETIMSK = 0x01;                                      // OCIE1C = '1'
                  TCCR1A = 0x04;                                      // COM1Cx = '01' : OC1C 토글
                  TCCR1B = 0x05;                                       // 프리스케일 = CK/1024
                  TCNT1 = 0x0000;                                      // 레지스터 초기값 : 16비트
                  OCR1CH = ( 7812 & 0xff00 ) >> 8;           // 비교 매치 C 레지스터
                  OCR1CL = 7812 & 0x00ff;
                  SREG = 0x80;                                            // 전역 인터럽트 인에이블 비트 I 셋
                 
                  while(1);
}//end main            

interrupt [TIM1_COMPC] void Timer1_compc(void){
                  TCNT1 = 0x0000;
}//endTIM1

 

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◆◆ ATmega128 , Timer Couter, EXT_INT P.245 ◆◆

 

0310A_TimerCounter_p245.c

0310A_TimerCounter_p245.hex

0310A_TimerCounter_p245.prj

 

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/*
               TimerCounter   T/C1 > PWM , mode 3 제어   P.245
               SW8 > OC1C - LED   on 시간 증가
               SW14 > OC1C - LED on 시간 감소
               0310A_TimerCounter_p245.c
*/           

#include <mega128.h>

unsigned int PWM = 0x0200;                      // 현재의 출력비교 레지스터 값 저장

void main(void)
{
                  // I/O 포트 설정
                  DDRB = 0xff;                            // OC1C (PB7) 출력 설정
                 
                  // 외부 인터럽트 초기화
                  EIMSK = 0b00110000;                 // 외부 INT4 = 1, INT5 = 1
                  EICRB = 0b00001010;                  // 외부 인터럽트 하강 에지
                 
                  // 타이머/카운터1 초기화
                  TCCR1A = 0b00001011;                   // 모드3 , 10비트 PC PWM
                 
                  /*
                        // up count compare match - OC1C = 0 출력
                        // daown count compare match - OC1C = 1 출력
                        // OC1B 출력 업 카운트에서 클리어, 다운에서 셋                 
                    */                                                                               
                    TCCR1B = 0x05;                           // T/C1 prescaler = CK/1024
                    TCCR1C = 0x00;                          
                    TCNT1 = 0x0000;                          // T/C1 registor : 16bit
                    OCR1CH = ( PWM & 0xff00) >> 8;
                    OCR1CL = PWM & 0x00ff;
                    SREG = 0x80;
                   
                    while(1);
}//end main              

interrupt [EXT_INT4] void External_int4(void){
                   if( PWM > 0x0050) PWM -= 0x0040;
                   OCR1CH = ( PWM & 0xff00 ) >> 8;
                   OCR1CL = PWM & 0x00ff;
}//endEXT4                                          

interrupt [EXT_INT5] void External_int5(void){
                   if( PWM < 0x03b0 ) PWM += 0x0040;
                   OCR1CH = ( PWM & 0xff00 ) >> 8;
                   OCR1CL = PWM & 0x00ff;
}//endEXT5   

 

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