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STC12C2052 Datasheet(PDF) 48 Page - List of Unclassifed Manufacturers

Part # STC12C2052
Description  STC12C2052AD
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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STC12C2052 Datasheet(HTML) 48 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
48
高速输出模式
   该模式中(下图),当 PCA 计数器的计数值与模块捕获寄存器的值相匹配时,PCA 模块的 CEXn 输出将
发生翻转。要激活高速输出模式,模块 CCAPMn SFR 的 TOG,MAT 和 ECOM 位必须都置位。
  PCA
Interupt
脉宽调节模式
   所有 PCA 模块都可用作 PWM 输出(下图)。输出频率取决于 PCA 定时器的时钟源。
1
0
0
0
0
1
0
   由于所有模块共用仅有的 PCA 定时器,所有它们的输出频率相同。各个模块的输出占空比是独立变
化的,与使用的捕获寄存器{EPCnL,CCAPnL}有关。当 CL SFR 的值小于{EPCnL,CCAPnL}时,输出
为低,当 PCA CL SFR 的值等于或大于{EPCnL ,CCAPnL }时,输出为高。当 CL 的值由 FF 变为 00
溢出时,
{EPCnH,CCAPnH}的内容装载到{EPCnL,CCAPnL}中。这样就可实现无干扰地更新 PWM。要
使能 PWM 模式,模块 CCAPMn 寄存器的 PWMn 和 ECOMn 位必须置位。
PCA High-Speed Output Mode / PCA 高速输出模式
CF
CR
CCF1
CCF0
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
CCON
(To CCFn)
CCAPnH
CCAPnL
CH
CL
Match
Enable
0
1
CEXn
Toggle
CCAPMn
Write to CCAPnH
Write to CCAPnL
0
0
1
1
0
16-Bit comparator
翻转
  
CL
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
(0,CL) <  (EPCnL,CCAPnL)
(0,CL) >= (EPCnL,CCAPnL)
输出 0
输出 1
Enable
CL overflow
CEXn
CCAPMn, n=0,1
PCA PWM mode /  可调制脉冲宽度输出模式
CCAPnH
EPCnH
CCAPnL
EPCnL
  0
  9-BIT
COMPARATOR


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