广州周立功单片机发展有限公司 Tel: (020) 38730916 38730917 38730976 38730977 Fax: 38730925
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5.3.2 片外存储器 ············································································································127
5.3.3 存储器映射 ············································································································127
5.3.4 预取指中止和数据中止异常 ·················································································131
5.3.5 存储器重映射及引导块·························································································132
5.3.6 启动代码相关部分·································································································134
5.4 系统控制模块···················································································································136
5.4.1 系统控制模块功能汇总·························································································136
5.4.2 引脚描述 ················································································································137
5.4.3 寄存器描述 ············································································································137
5.4.4 晶体振荡器 ············································································································138
5.4.5 复位························································································································139
5.4.6 外部中断输入 ········································································································142
5.4.7 外部中断应用示例·································································································145
5.4.8 存储器映射控制·····································································································146
5.4.9 PLL(锁相环) ·····································································································148
5.4.10 VPB 分频器············································································································153
5.4.11 功率控制 ················································································································154
5.4.12 唤醒定时器 ············································································································156
5.4.13 启动代码相关部分·································································································156
5.5 存储器加速模块(MAM) ····························································································158
5.5.1 描述························································································································158
5.5.2 MAM 结构 ·············································································································159
5.5.3 MAM 的操作模式··································································································160
5.5.4 MAM 配置 ·············································································································
161
5.5.5 寄存器描述 ············································································································161
5.5.6 MAM 使用注意事项······························································································162
5.5.7 启动代码相关部分·································································································162
5.6 外部存储器控制器(EMC) ·························································································163
5.6.1 特性························································································································163
5.6.2 概述························································································································163
5.6.3 引脚描述 ················································································································164
5.6.4 寄存器描述 ············································································································164
5.6.5 外部存储器接口·····································································································166
5.6.6 典型总线时序 ········································································································168
5.6.7 外部存储器选择·····································································································168
5.6.8 启动代码相关部分·································································································169
5.7 引脚连接模块···················································································································170
5.7.1 介绍························································································································170
5.7.2 寄存器描述 ············································································································170
5.7.3 引脚功能控制 ········································································································173
5.7.4 启动代码相关部分·································································································173