定时器控制led

Zedd

定时器控制led
#define ucharunsigned char
0 q0 A# {% N* K5 t4 ?% u1 F! q0 j* H#define uint unsigned int
sbit pwm=P1^0;
uint N;
/ e0 \( ]8 i* p) m5 g2 @void main()
7 T- P" A5 {" F, _- o- n1 u3 }) V6 A{
. U1 R" \6 p$ S& R" {* ]  TMOD=0x01;
  TH1=(65536-50000)/256;
& y& q5 V* `$ e) H' n# _' x( o( I  TL1=(65536-50000)%256;
0 n& u( d+ Y5 d  f  EA=1;
  ET1=1;
& u7 D: ^7 f' J7 Q4 p% ?8 ]1 u  TR1=1;
  while(1);
9 G4 ?; Y8 E7 H: [  }
  void T1_time()interrupt 3
( v" }/ W0 F! j  {
* A3 A$ v6 r0 g! Y2 S  Z$ a* C    TH1=(65536-50000)/256;
    TL1=(65536-50000)%256;
* Y* i' b0 b; r       N++;
/ {' T3 [1 |/ U* n0 ]5 X       if(N>40)
8 P8 N, G  j/ I5 ]/ m% e( B        N=0;
       if(N<=20)
& Z, ?0 y; s/ V* z' y9 n1 X. B" @        pwm=1;
4 g0 c* B4 W+ O* E" k+ O- `       else
' T" O, i& E; C/ J' X        pwm=0;
9 q+ d& {) l: p3 s9 ]& m; ~}
+ x% W! ^6 D+ ]# X$ i

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