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參數(shù)資料
| 型號： | MC68HC05L16CFU |
| 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, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 56/146頁 |
| 文件大?。?/td> | 852K |
| 代理商： | MC68HC05L16CFU |
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Functional Pin Description
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
17
1.5.1 VDD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is the positive supply, and VSS is ground. The
MCU operates from a single power supply. Very fast signal transitions occur on the MCU pins. The short
rise and fall times place very high short-duration current demands on the power supply. To prevent noise
problems, special care should be taken to provide good power supply bypassing at the MCU by using
bypass capacitors with good high-frequency characteristics that are positioned as close to the MCU as
possible. Bypassing requirements vary, depending on how heavily the MCU pins are loaded.
1.5.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the 2-pin on-chip oscillator. The OSC1 and OSC2 pins
can accept:
A crystal as shown in Figure 1-3(a)
An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided by 64 to produce the internal
operating frequency, fOP, by default.
1.5.2.1 Crystal or Ceramic Resonator
The circuit in Figure 1-3(a) shows a typical 2-pin oscillator circuit for an AT-cut, parallel resonant crystal.
The crystal manufacturer’s recommendations should be followed, as the crystal parameters determine
the external component values required to provide maximum stability and reliable startup. 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 startup stabilization and to
minimize output distortion. An internal startup feedback resistor of ROF between OSC1 and OSC2 may
be selected as a mask option for MC68HC05L16. Typical ROF resistor value is 5.5 M.
Figure 1-3. Oscillator Connections
MCU
CO2
(a) Crystal Connections
OSC1
OSC2
CO1
ROF
UNCONNECTED
EXTERNAL CLOCK
(b) External Clock
Source Connection
OSC1
OSC2
MCU
4 MHz (TYP)
MASK OPTIONS
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