![](https://csdnimg.cn/release/download_crawler_static/11970179/bg11.jpg)
小节编号 标题 页
20.4 功能说明.........................................................................................................................................................................278
20.4.1 工作模式..........................................................................................................................................................278
20.4.1.1 FLL 内部启用(FEI).....................................................................................................................279
20.4.1.2 FLL 外部启用(FEE)....................................................................................................................279
20.4.1.3 FLL 内部旁路(FBI).....................................................................................................................280
20.4.1.4 FLL 内部旁路低功耗(FBILP)....................................................................................................280
20.4.1.5 FLL 外部旁路(FBE)....................................................................................................................280
20.4.1.6 FLL 外部旁路低功耗(FBELP)...................................................................................................280
20.4.1.7 停止..............................................................................................................................................281
20.4.2 模式切换..........................................................................................................................................................281
20.4.3 总线频率分频器..............................................................................................................................................281
20.4.4 低功耗字段的使用..........................................................................................................................................281
20.4.5 内部参考时钟..................................................................................................................................................282
20.4.6 固定频率时钟..................................................................................................................................................282
20.4.7 FLL 锁定和时钟监视器..................................................................................................................................282
20.4.7.1 FLL 时钟锁定..............................................................................................................................282
20.4.7.2 外部基准时钟监视器..................................................................................................................283
20.5 初始化/应用信息........................................................................................................................................................... 283
20.5.1 初始化 FEI 模式..............................................................................................................................................283
20.5.2 初始化 FBI 模式............................................................................................................................................. 284
20.5.3 初始化 FEE 模式.............................................................................................................................................284
20.5.4 初始化 FBE 模式............................................................................................................................................ 284
第 21 章
振荡器(OSC)
21.1 简介.................................................................................................................................................................................287
21.1.1 概述..................................................................................................................................................................287
21.1.2 特性和模式......................................................................................................................................................287
21.1.3 结构框图..........................................................................................................................................................287
21.2 信号说明.........................................................................................................................................................................288
KEA128 子系列参考手册, Rev. 2, July 2014
Freescale Semiconductor, Inc. 17