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14串行I / O端口............................................ ............................................. 48
14.1
14.2
14.3
14.4
14.5
帧错误检测............................................... ................................... 48
自动地址识别............................................... ....................... 49
注册.........................................................................................................51
波特率选择为UART的模式1和3 ........................................ .... 51
UART的寄存器................................................ ............................................... 54
15键盘接口............................................... ................................. 59
15.1
注册.........................................................................................................60
16串行端口接口（ SPI ） ........................................... ........................... 63
16.1
16.2
16.3
产品特点..........................................................................................................63
信号说明................................................ ............................................ 63
功能说明................................................ ..................................... 65
17中断系统............................................... ..................................... 72
17.1
17.2
注册.........................................................................................................73
中断源和向量地址............................................. ............ 73
18电源管理............................................... ................................ 80
18.1
18.2
18.3
18.4
介绍......................................................................................................80
空闲模式.........................................................................................................80
掉电模式.............................................. ............................................ 81
注册.........................................................................................................83
19硬件看门狗定时器.............................................. ..................... 84
19.1
19.2
使用WDT ............................................... ................................................. 84
在掉电和空闲WDT ........................................... ........................ 85
20 ONCE
模式（片上仿真） ........................................... .......... 86
21断电标志............................................. ........................................... 87
22降低EMI模式.............................................. .................................. 88
23 EEPROM数据存储器.............................................. ............................ 89
23.1
23.2
23.3
写数据........................................................................................................89
读数据.......................................................................................................90
注册.........................................................................................................91
24闪存/ EEPROM存储器............................................. ........................... 93
24.1
24.2
136
产品特点..........................................................................................................93
闪存编程和擦除.............................................. ....................... 93
AT89C51RD2/ED2
4235K–8051–05/08
