目录

功能................................................. ................................................ 1

说明................................................. ........................................... 2

框图................................................ ....................................... 3

SFR映射................................................ ......................................... 4

引脚配置................................................ .............................. 10

振荡器................................................. .......................................... 14

Overview.............................................................................................................

Registers.............................................................................................................

功能框图............................................... ....................................

操作模式................................................ ................................................

设计Considerations........................................................................................

定时器0 ：时钟输入............................................. .............................................

14

14

17

17

19

20

增强功能................................................ ............................. 21

X2功能和OSCA时钟发生器............................................ ............... 21

双数据指针寄存器.............................................. .................. 25

扩展存储器（ XRAM ） ............................................. ........................ 27

定时器2 ................................................ ................................................. 30

自动加载模式.............................................. ................................................ 30

可编程时钟输出.............................................. ................................ 31

可编程计数器阵列PCA .............................................. ..... 35

PCA捕捉模式............................................... ..............................................

16位软件定时器/比较模式.......................................... .....................

高速输出模式.............................................. .....................................

脉宽调制器方式.............................................. ................................

PCA看门狗定时器............................................... ..........................................

43

43

44

45

46

串行I / O端口............................................. ......................................... 47

帧错误检测............................................... ......................................

自动地址识别............................................... ...........................

波特率选择为UART的模式1和3 ........................................ .......

UART Registers..................................................................................................

47

48

50

54

中断系统................................................ ................................. 58

Registers............................................................................................................. 59

i

AT89C51IC2

4301C–8051–06/06