C8051F70x/71x
20.4.1 。 VDD维护和VDD监视器............................................ 137 ..
20.4.2 。 PSWE维护................................................ .............................. 137
20.4.3 。系统时钟................................................ ........................................ 138
21. EEPROM ............................................................................................................... 141
21.1 。 RAM读取和写入.............................................. ................................... 141
21.2 。自动递增................................................ .............................................. 141
21.3 。与EEPROM接口.............................................. .......................... 141
21.4 。 EEPROM安全................................................ ......................................... 142
22.电源管理模式............................................. .................................... 146
22.1 。空闲Mode....................................................................................................... 146
22.2 。停止模式..................................................................................................... 147
22.3 。挂起模式................................................ .............................................. 147
23.复位源...................................................................................................... 149
23.1 。上电复位.............................................. .............................................. 150
23.2 。掉电复位/ VDD监视器........................................... ........................ 151
23.3 。外部复位................................................ ............................................... 152
23.4 。时钟丢失检测器复位.............................................. ......................... 152
23.5 。比较器复位................................................ ....................................... 153
23.6 。看门狗定时器复位............................................... ................................... 153
23.7 。 FLASH错误复位............................................... ........................................... 153
23.8 。软件复位................................................ .............................................. 153
24.看门狗Timer................................................................................................... 155
24.1 。启用/复位WDT .............................................. .......................................... 155
24.2 。禁止WDT ................................................ ................................................. 155
24.3 。禁止WDT锁定............................................... ..................................... 155
24.4 。设置WDT间隔............................................... ...................................... 155
25.振荡器和时钟选择............................................ ............................. 157
25.1 。系统时钟选择............................................... .................................. 157
25.2 。可编程内部高频( HF )振荡器.............................. 159
25.3 。外部振荡器驱动电路.............................................. ....................... 161
25.3.1 。外部晶体示例............................................... ....................... 163
25.3.2 。外部RC示例............................................... ............................. 164
25.3.3 。外部电容举例............................................... ................... 165
26.端口输入/输出............................................ .................................................. ... 166
26.1 。操作端口I / O模式........................................... ............................... 167
26.1.1 。端口引脚配置为模拟I / O .......................................... ............ 167
26.1.2 。端口引脚配置为数字I / O .......................................... ............ 167
26.1.3 。接口端口I / O至5 V逻辑......................................... ................... 168
26.1.4 。越来越多端口I / O驱动强度........................................... ............. 169
26.2 。分配端口I / O引脚的模拟和数字功能............................... 169
26.2.1 。分配端口I / O引脚的模拟功能........................................ 169
26.2.2 。分配端口I / O引脚数字功能......................................... 。 170
26.2.3 。分配端口I / O引脚的外部事件触发功能................ 170
26.3 。优先权交叉开关译码器............................................... .............................. 171
26.4 。端口I / O初始化............................................. ......................................... 173
修订版0.2
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