參數(shù)資料
型號： MC68HC705X4
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 25/156頁
文件大?。?/td> 926K
代理商： MC68HC705X4
Modes of Operation and Pin Descriptions
Pin descriptions
MC68HC05X4 Rev 1.0
MOTOROLA
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
25
13-modes
C eramic
resonator
A ceramic resonator may be used instead of the crystal in cost-sensitive
applications. The circuit in
Figure 8
(a) is recommended when using a
ceramic resonator. The manufacturer of the particular ceramic resonator
being considered should be consulted for specific information. This
option is recommended only for applications that operate at an external
clock frequency of 8MHz or less. Any application requiring an external
operating frequency greater that 8MHz should use either a crystal
oscillator or an external CMOS compatible clock source.
External clock
An external clock should be applied to the OSC1 input with the OSC2 pin
not connected, as shown in
Figure 8
(c). The t
OXOV
specification does not
apply when using an external clock input. The equivalent specification of
the external clock source should be used in lieu of t
OXOV
.
Figure 8. Oscillator connections
OSC1
OSC2
MCU
C
OSC2
C
OSC1
OSC1
OSC2
MCU
NC
External
clock
OSC1
OSC2
R
S
C
1
L
C
0
(c) External clock source connections
(b) Crystal equivalent circuit
(a) Crystal/ceramic resonator
oscillator connections
F
Freescale Semiconductor, Inc.
n
.
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