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參數(shù)資料
| 型號： | MC68HC05LJ5P |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 7/85頁 |
| 文件大?。?/td> | 899K |
| 代理商： | MC68HC05LJ5P |
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November 10, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05LJ5
GENERAL DESCRIPTION
MOTOROLA
REV 1
1-5
Figure 1-4. Oscillator Connections
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 res-
onator manufacturer’s recommendations should be followed, as the resonator
parameters determine the external component values required for maximum sta-
bility and reliable starting. The load capacitance values used in the oscillator cir-
cuit design should include all stray capacitances. The ceramic resonator and
components should be mounted as close as possible to the pins for start-up stabi-
lization and to minimize output distortion. An internal start-up resistor of approxi-
mately 2 M
is provided between OSC1 and OSC2/R for the ceramic resonator
type oscillator as a mask option.
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
nal R tied to VSS. The internal start-up resistor of approximately 2 M is not con-
nected 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 tol-
erance 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
37pF
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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