參數(shù)資料
型號(hào)： MC68HC05J5CJDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 7/69頁(yè)
文件大?。?/td> 394K
代理商： MC68HC05J5CJDW
December 11, 1996
GENERAL RELEASE SPECIFICATION
MC68HC05J5
GENERAL DESCRIPTION
MOTOROLA
REV 1.1
1-5
Figure 1-4. Oscillator Connections
1.3.2.2
Ceramic Resonator Oscillator
In cost-sensitive applications, a ceramic resonator can be used in place of the
crystal. The circuit in Figure 1-4(a) can be used for a ceramic resonator. The
resonator manufacturer’s recommendations should be followed, as the resonator
parameters determine the external component values required for maximum
stability and reliable starting. The load capacitance values used in the oscillator
circuit design should include all stray capacitances. The ceramic resonator and
components should be mounted as close as possible to the pins for start-up
stabilization and to minimize output distortion. An internal start-up resistor of
approximately 2 M
is provided between OSC1 and OSC2/R for the ceramic
resonator type oscillator as a mask option.
1.3.2.3
RC Oscillator
The lowest cost oscillator is the RC oscillator conguration. With this option an
external resistor is connected between OSC2/R pin and the VSS pin as shown in
Figure 1-4(b). The typical operating frequency fOSC is set at 4 MHz with the
external R tied to VSS. The internal start-up resistor of approximately 2 M is not
connected between OSC1 and OSC2/R for the mask option of the RC type
oscillator.
The tolerance of this RC oscillator is guaranteed to be no greater than
±15% at
the specied conditions of 0
°C to 40 °C and 5V ±10% V
DD providing that the
tolerance of the external resistor R is at most
±1% and the center frequency range
is from 3.8MHz to 4.2MHz. The center frequency is the nominal operating
frequency of the RC oscillator and can be adjusted by adjusting the external R
value to change the internal VCO charging current.
In order to obtain an oscillator clock with the best possible tolerance, the external
resistor connected to the OSC2/R pin should be grounded as close to the VSS pin
as possible and the other terminal of this external resistor should be connected as
close to the OSC2/R pin as possible.
MCU
37 pF
OSC1
OSC2/R
37 pF
2M
R
unconnected
External Clock
OSC1
OSC2/R
MCU
OSC1
OSC2/R
MCU
(a) Crystal or ceramic
resonator connection
(b) RC oscillator connection
(c) External clock source
connection
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