參數資料
型號: FM8P54E
廠商: Electronic Theatre Controls, Inc.
英文描述: EPROM/ROM-Based 8-Bit Microcontroller Series
中文描述: 存儲器/基于ROM的8位微控制器系列
文件頁數: 23/50頁
文件大?。?/td> 368K
代理商: FM8P54E
FM8P54/56
Rev1.21 May 31, 2005
P.23/FM8P54/56
FEELING
TECHNOLOGY
2.8 Oscillator Configurations
FM8P54/56 can be operated in four different oscillator modes. Users can program two configuration bits
(Fosc<1:0>) to select the appropriate modes:
LF: Low Frequency Crystal Oscillator
XT: Crystal/Resonator Oscillator
HF: High Frequency Crystal/Resonator Oscillator
ERC: External Resistor/Capacitor Oscillator
In LF, XT, or HF modes, a crystal or ceramic resonator in connected to the OSCI and OSCO pins to establish
oscillation. When in LF, XT, or HF modes, the devices can have an external clock source drive the OSCI pin.
The ERC device option offers additional cost savings for timing insensitive applications. The RC oscillator
frequency is a function of the supply voltage, the resistor (Rext) and capacitor (Cext), the operating temperature,
and the process parameter.
FIGURE 2.6: HF, XT or LF Oscillator Modes (Crystal Operation or Ceramic Resonator)
FIGURE 2.7: HF, XT or LF Oscillator Modes (External Clock Input Operation)
FIGURE 2.8: ERC Oscillator Mode
FM8P54/56
OSCI
OSCO
SLEEP
Internal
Circuit
RS
X’TAL
C1
C2
RF
FM8P54/56
OSCI
OSCO
Open
Clock from
External System
FM8P54/56
OSCI
OSCO
Rext
Internal
Circuit
/2, /4, /8
Cext
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