參數(shù)資料
型號(hào)： MC68HC705CL4FU
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 1.84 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 8/101頁(yè)
文件大?。?/td> 517K
代理商： MC68HC705CL4FU
GENERAL RELEASE SPECIFICATION
February 12, 1997
MOTOROLA
GENERAL DESCRIPTION
MC68HC05CL4
1-4
REV 2.0
1.5.2 OSC1, OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The
OSC1, and OCS2 pins can accept the following sets of components:
1.
A crystal as shown in Figure 1-3(a)
2.
An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP.
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 external start-up
resistor of approximately 2 M
is needed between OSC1 and OSC2 for the crys-
tal type oscillator.
Figure 1-3. Oscillator Connections
An external clock from another CMOS-compatible device can be connected to the
OSC1 input, with the OSC2 input not connected, as shown in Figure 1-3(b).
1.5.3 RESET
This pin can be used as an input to reset the MCU to a known start-up state by
pulling it to the low state. The RESET pin contains a steering diode to discharge
any voltage on the pin to VDD, when the power is removed. The RESET pin con-
tains an internal Schmitt trigger to improve its noise immunity as an input. The
RESET pin has an internal pull-down device that pulls the RESET pin low when
there is an internal COP Watchdog reset or during the power-on reset cycles.
Refer to Section 5.
MCU
36 pF
(a) Crystal or
Ceramic Resonator
Connections
OSC1
OSC2
36 pF
2M
unconnected
External Clock
(b) External
Clock Source
Connection
OSC1
OSC2
MCU
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