Timer Count, TC 1.3, AVR, ATmega128 - 0308

 

 Timer Count, TC 1.3, AVR, ATmega128  

[ 간략 설명 ]

◈ Timer Count, TC 1.3, AVR, ATmega128

 
 참조 :    P.93  8-bit Timer/Counter     P.112 16-bit Timer/Counter   

ATmega128_p386.pdf

 

 

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ATmega128 : Timer Count : T/C 1 > LED 제어 : Interrupt 진행순서 P.238

( 8-bit )

0x9c40 (16진수) = 40000 (10진수)

① TCNT1 [ TCNT1 H (8bit), TCNT1 L (8bit) ] ( 16bit )  :  '40000' ~> '65535'

② TCNT1 : '65535' 가 되면 '0'이 되고, overflow가 발생

③ TIMSK : ( TOIE0 값이 '0' → '1' )   =>  TIFR : ( TOV0 값이 '0' → '1' ) (TIFR은 CPU에서 처리)

④ [TIM1_OVF] : interrupt 실행 ~ 실행이 끝나면 TIMSK로 던져준다.

⑤ TIMSK : ( TOIE0 값이 '1' → '0' )   =>  TIFR : ( TOV0 값이 '1' → '0' )

 

 

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ATmega128 : Timer Count : T/C 1 >  OCR > LED 제어 : Interrupt 진행순서 P.243 

( 16-bit )

 

// 타이머/카운터 1 비교 A 매치 인터럽트 서비스 루틴
// (1/16)us * OCR1A(32768) * 256분주 = 524ms

 

 

Timer Count, TC 1.3, AVR, ATmega128

내용 넣기~~~~

 

LED 제어 ◆◆">LED 제어 ◆◆">LED 제어 ◆◆">LED 제어 ◆◆">

 
◆◆ ATmega128 : Timer Count : T/C 1 > LED 제어 ◆◆

0308A_TimerCount_p238.c

0308A_TimerCount_p238.hex

0308A_TimerCount_p238.prj

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/*
               Timser Count     T/C 1 -> LED 제어 ( Normal Mode )     P.238
               TCNT1 = 0x9c40 (4000) > 256분주 > LED shift On/Off
               0308A_TimerCount_p238.c
*/                                                     

#include <mega128.h>

unsigned char Led = 0xfe;
unsigned int Time = 0x9c40;                 // TCNT1 = 4000 (10진수), 9c40 ( 16 진수 )

void main(void)
{
                  //포트 초기화
                  DDRC = 0xff;
                  PORTC = Led;
                  //인터럽트 초기화
                  TIMSK = 0x04;                          // TOIE1 = 1
                  TCCR1A = 0x00;                         // mode 0 (일반)
                  TCCR1B = 0x04;                          // 프리스케일 = CK/256
                  TCCR1C = 0x00;
                  TCNT1 = Time;
                  SREG = 0x80;
                  while(1);
}//end main
                              
interrupt [TIM1_OVF] void Timer_int1(void){
                  //LED on, off
                  Led <<=1;
                  Led |= 0x01;
                  if( Led == 0xff ) Led = 0xfe;
                  PORTC = Led;
                  TCNT1 = Time;
}//endTIM1

 

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Switch > LED 제어 ◆◆">Switch > LED 제어 ◆◆">

◆◆ ATmega128 : Timer Count : T/C 3 >  Switch > LED 제어 ◆◆ 

 

 

0308B_TimerCount_p239.c

0308B_TimerCount_p239.hex

0308B_TimerCount_p239.prj

---

 /*
               Timer Count      T/C 3 > LED shift                  P.239
               T3( PIN 8 ), SW15 switch, LED > shift
               0308B_TimerCount_p239.c
*/           

#include <mega128.h>

unsigned char Led = 0b11111110;

void main(void)
{
                  //포트 초기화
                  DDRC = 0xff;
                  PORTC = Led;
                  //인터럽트 초기화
                  ETIMSK = 0b00000100;                  // TOIE3 = '1'
                  TCCR3A = 0x00;                             // 외부 T0핀의 하강 에지 선택
                  TCCR3B = 0x06;                              // T3 falling edeg counting, 9x07 > rising edge
                  TCCR3C = 0x00;                                                                                                   
                  TCNT3H = 0xff;                               // TCNT3 초기값 설정
                  TCNT3L = 0xff;
                  SREG = 0x80;
                  while(1);                 
}//end main            

interrupt [TIM3_OVF] void Timer_int3(void){
                  Led <<=1;
                  Led |= 0x01;
                  if( Led == 0xff ) Led = 0xfe;
                  PORTC = Led;
                  TCNT3H = 0xff;
                  TCNT3L = 0xff;
}//endTIM3

 

 

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OCR > LED 제어 ◆◆">

 ◆◆ ATmega128 : Timer Count : T/C 1 >  OCR > LED 제어 ◆◆ 

 

0308C_TimerCount_p243.c

0308C_TimerCount_p243.hex

0308C_TimerCount_p243.prj

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/*
               Timer Count        T/C 1   >  OCR  >  LED 제어         P.243
               T/C1 > OCR1A > 0x8000(32768) 
               비교매치 interrupt 발생 > LED shift
               0308C_TimerCount_p243.c
*/                                                  

#include <mega128.h>

unsigned char Led = 0xfe;

void main(void)
{
                  // 포트 초기화
                  DDRC = 0xff;
                  PORTC = Led;
                 
                  // 인터럽트 초기화
                  TIMSK = 0x10;                                // OCIE1A = 1, 출력비교 A 인터럽트 인에이블
                  TCCR1A = 0x00;                               // 모드 0 (일반모드)
                  TCCR1B = 0x04;                                // 프리스케일 = CK/256
                  TCCR1C = 0x00;
                  TCNT1 = 0x0000;                               // T/C 1 레지스터 초기값 : 16비트
                  OCR1A = 0x8000;                              // T/C 1 비교 매치 A 레지스터 : 16비트
                  SREG = 0x80;                                    // 전역 인터럽트 인에이블 비트 I 셋
                 
                  while(1);
}//end main            

// 타이머/카운터 1 비교 A 매치 인터럽트 서비스 루틴
// (1/16)us * OCR1A(32768) * 256분주 = 524ms
interrupt [TIM1_COMPA] void Timer1_Compa(void){
                  // LED on/off
                  Led <<= 1;
                  Led |= 0x01;
                  if( Led == 0xff ) Led = 0xfe;
                  PORTC = Led;
                  TCNT1 = 0x0000;
}//endTIM1
                             

 

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