參數(shù)資料
型號(hào)： MC68HC05P9ACP
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, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 57/158頁
文件大?。?/td> 3885K
代理商： MC68HC05P9ACP
Pin Descriptions
Pin Functions
Pin Descriptions
Pin Functions
V
DD and VSS
V
DD and VSS are the power supply and ground pins. The MCU operates
from a single 5-V power supply.
Very fast signal transitions occur
on the MCU pins, placing high
short-duration current demands
on the power supply. To prevent
noise problems, take special
care to provide good power
supply bypassing at the MCU as
Figure 3 shows. Place the
bypass capacitors as close as
possible to the MCU. C2 is an
optional bulk current bypass
capacitor for use in applications
that require the port pins to
source high current levels.
OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of the following:
Crystal
Ceramic resonator
RC Oscillator
External clock signal
The frequency of the on-chip oscillator is f
OSC. The MCU divides the
internal oscillator output by two to produce the internal clock with a
frequency of f
OP.
MCU
V
DD
V
SS
C1
0.1
F
C2
V
DD
+
Figure 3. Bypassing
Recommendation
7-mc68hc05p9a
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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