參數(shù)資料
型號: MC68HC705K1
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 21/140頁
文件大?。?/td> 803K
代理商: MC68HC705K1
General Description
Pin Assignments
MC68HC705K1 — Rev. 2.0
TechnicalData
General Description
NOTE:
UseanAT-cutcrystalandnotastriportuningforkcrystal.TheMCUmay
overdrive or have the wrong characteristic impedance for a strip or
tuning fork crystal.
To use the crystal-driven oscillator, the RC and PIN3 bits in the mask
option register must be clear. See
9.6 Mask Option Register
. Clearing
the RC bit connects an internal 2-M
startup resistor between OSC1
and OSC2.
1.6.2.2 Ceramic Resonator
To reduce cost, use a ceramic resonator in place of the crystal. Use the
circuit in
Figure 1-5
for a 2-pin ceramic resonator or
Figure 1-6
for a
3-pin ceramic resonator, and follow the resonator manufacturer’s
recommendations. 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 layout capacitances. To minimize output distortion,
mount the resonator and capacitors as close as possible to the pins.
Figure 1-5. 2-Pin Ceramic Resonator Connections
MCU
V
DD
V
SS
OSC1
OSC2
CER.
RES.
V
SS
O
O
CERAMIC
RESONATOR
C3
27 pF
C4
27 pF
2 M
C1 C2
C
C
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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