C8051F70x/71x
20.4.1 。 VDD维护和VDD监视器............................................ 136 ..
20.4.2 。 PSWE维护................................................ .............................. 136
20.4.3 。系统时钟................................................ ........................................ 137
21. EEPROM ............................................................................................................... 140
21.1 。 RAM读取和写入.............................................. ................................... 140
21.2 。自动递增................................................ .............................................. 140
21.3 。与EEPROM接口.............................................. .......................... 140
21.4 。 EEPROM安全................................................ ......................................... 141
22.电源管理模式............................................. .................................... 145
22.1 。空闲Mode....................................................................................................... 145
22.2 。停止模式..................................................................................................... 146
22.3 。挂起模式................................................ .............................................. 146
23.复位源...................................................................................................... 148
23.1 。上电复位.............................................. .............................................. 149
23.2 。掉电复位/ VDD监视器........................................... ........................ 150
23.3 。外部复位................................................ ............................................... 151
23.4 。时钟丢失检测器复位.............................................. ......................... 151
23.5 。比较器复位................................................ ....................................... 152
23.6 。看门狗定时器复位............................................... ................................... 152
23.7 。 FLASH错误复位............................................... ........................................... 152
23.8 。软件复位................................................ .............................................. 152
24.看门狗Timer................................................................................................... 154
24.1 。启用/复位WDT .............................................. .......................................... 154
24.2 。禁止WDT ................................................ ................................................. 154
24.3 。禁止WDT锁定............................................... ..................................... 154
24.4 。设置WDT间隔............................................... ...................................... 154
25.振荡器和时钟选择............................................ ............................. 156
25.1 。系统时钟选择............................................... .................................. 156
25.2 。可编程内部高频( HF )振荡器.............................. 158
25.3 。外部振荡器驱动电路.............................................. ....................... 160
25.3.1 。外部晶体示例............................................... ....................... 162
25.3.2 。外部RC示例............................................... ............................. 163
25.3.3 。外部电容举例............................................... ................... 164
26.端口输入/输出............................................ .................................................. ... 165
26.1 。操作端口I / O模式........................................... ............................... 166
26.1.1 。端口引脚配置为模拟I / O .......................................... ............ 166
26.1.2 。端口引脚配置为数字I / O .......................................... ............ 166
26.1.3 。接口端口I / O至5 V逻辑......................................... ................... 167
26.1.4 。越来越多端口I / O驱动强度........................................... ............. 168
26.2 。分配端口I / O引脚的模拟和数字功能............................... 168
26.2.1 。分配端口I / O引脚的模拟功能........................................ 168
26.2.2 。分配端口I / O引脚数字功能......................................... 。 169
26.2.3 。分配端口I / O引脚的外部事件触发功能................ 169
26.3 。优先权交叉开关译码器............................................... .............................. 170
26.4 。端口I / O初始化............................................. ......................................... 172
修订版0.3
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