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STC12C2052 Datasheet(PDF) 53 Page - List of Unclassifed Manufacturers

Part No. STC12C2052
Description  STC12C2052AD
Download  71 Pages
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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STC12C2052 Datasheet(HTML) 53 Page - List of Unclassifed Manufacturers

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宏晶科技:www.MCU-Memory.com   Mobile:13922805190(姚永平)   Tel:0755-82948409    Fax: 0755-82944243
宏晶科技:专业单片机 / 存储器供应商   www.MCU-Memory.com   STC12C2052AD 系列 1T 8051 单片机中文指南
53
    MOV   P1, A               ;占空比 = ( pulse_width/256 ) * 100%  。
    MOV   A, pulse_width    ;计算下一次输出脉冲宽度数值。
    CLR   C
    SUBB  A, #step
    MOV   pulse_width, A
    ACALL delay             ;在一段时间内保持输出脉冲宽度不变。
    SJMP  PWM_loop2
PWM_b:
    RET
;------------------------------------------------------------
delay:
    CLR   A
    MOV   R1, A
    MOV   R2, A
    MOV   R3, #80H
delay_loop:
    NOP
    NOP
    NOP
    DJNZ  R1, delay_loop
    DJNZ  R2, delay_loop
    DJNZ  R3, delay_loop
    RET
;------------------------------------------------------------
    END
以下是一个简单的 PWM 输出 C 语言示例
#include<reg52.h>
sfr  CCON = 0xD8;
sfr  CMOD = 0xD9;
sfr  CCAP0L = 0xEA;
sfr  CCAP0H = 0xFA;
sfr  CCAPM0 = 0xDA;
sfr  CCAPM1 = 0xDB;
sbit  CR = 0xDE;
void main(void)
    CMOD = 0x02; // Setup PCA timer
    CL = 0x00;
    CH = 0x00;
    CCAP0L = 0xc0;  //Set the initial value same as CCAP0H
    CCAP0H = 0xc0;  //25% Duty Cycle
    CCAPM0 = 0x42;  //0100,0010  Setup PCA module 0 in PWM mode
    CR = 1; //Start PCA Timer.
    while(1){};
 }
;------------------------------------------------------------


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