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參數(shù)資料
| 型號： | MC68HC05JB3JDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 58/148頁 |
| 文件大?。?/td> | 1600K |
| 代理商： | MC68HC05JB3JDW |
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November 5, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05JB3
GENERAL DESCRIPTION
MOTOROLA
REV 1
1-5
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP. If the internal operating frequency is
3MHz, then the external oscillator frequency will be 6MHz. For LS USB 1.5MHz
frequency clock can be derived from a divided by 4 circuit. The type of oscillator is
selected by a mask option. An internal 2M
resistor may be selected between
OSC1 and OSC2 by a mask option (crystal/ceramic resonator mode only).
Crystal Oscillator
The circuit in Figure 1-3(a) shows a typical oscillator circuit for an AT-cut, parallel
resonant crystal. The crystal manufacturer’s recommendations should be fol-
lowed, as the crystal parameters determine the external component values
required to provide maximum stability and reliable start-up. The load capacitance
values used in the oscillator circuit design should include all stray capacitances.
The crystal 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 2M
is provided between OSC1 and OSC2 for the crys-
tal type oscillator as a mask option.
Figure 1-3. Oscillator Connections
Ceramic Resonator Oscillator
In cost-sensitive applications, a ceramic resonator can be used in place of the
crystal. The circuit in Figure 1-3(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 for the ceramic resonator type
oscillator as a mask option.
MCU
OSC1
OSC2
2M
Unconnected
External Clock
MCU
OSC1
OSC2
(a) Crystal or Ceramic Resonator Connections
(b) External Clock Source Connection
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