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ch05

ch05. 系統時脈與看門狗. 特殊功能暫存器. 特殊功能暫存器 (SFR) S pecial F unction R egister 學微控制器，重點：知道不同的 micro-controller 有哪些 SFR ，每一 bit 的功能與用法 P_IOA_Data P_IOB_Data P_IOA_Dir, P_IOA_Attrib P_Watchdog_Clear. 本章相關的 SFR. P_SystemClock P_LVD_Ctrl P_Watchdog_Clear. 系統時脈產生. 鎖相迴路電路圖.

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ch05

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  1. ch05 系統時脈與看門狗

  2. 特殊功能暫存器 • 特殊功能暫存器(SFR) • Special Function Register • 學微控制器，重點：知道不同的micro-controller有哪些SFR，每一bit的功能與用法 • P_IOA_Data • P_IOB_Data • P_IOA_Dir, P_IOA_Attrib • P_Watchdog_Clear • ............

  3. 本章相關的SFR • P_SystemClock • P_LVD_Ctrl • P_Watchdog_Clear

  4. 系統時脈產生

  5. 鎖相迴路電路圖

  6. 低電壓監測(LVD)/低電壓重設(LVR)

  7. 重置電路

  8. P_SystemClock

  9. CPU 時脈頻率(CPUCLK)選擇

  10. PLL 頻率 (Fosc)的選擇

  11. P_LVD_Ctrl

  12. P_Watchdog_Clear

  13. CPU Clock內建常數

  14. OSC Frequency內建常數 • C_Fosc_24M  24.576M (預設值) • C_Fosc_20M  20.480M • C_Fosc_32M  32.768M • C_Fosc_40M  40.960M • C_Fosc_49M  49.152M

  15. Voltage Level內建常數 • C_LVD24V  LVD = 2.4V (預設值) • C_LVD28V  LVD = 2.8V • C_LVD32V  LVD = 3.2V

  16. 範例 • 5-1 watchdog 觀察 • 5-2 系統系脈設定

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