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參數(shù)資料
| 型號： | MC68HC05J5CDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 6/69頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MC68HC05J5CDW |
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GENERAL RELEASE SPECIFICATION
December 11, 1996
MOTOROLA
GENERAL DESCRIPTION
MC68HC05J5
1-4
REV 1.1
1.3
FUNCTIONAL PIN DESCRIPTION
The following paragraphs give a description of the general function of each pin
assigned in Figure 1-2 and Figure 1-3.
1.3.1 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.
1.3.2 OSC1, OSC2/R
The OSC1 and OSC2/R pins are the connections for the on-chip oscillator. The
OSC1 and OSC2/R pins can accept the following sets of components:
1.
A crystal as shown in Figure 1-4(a)
2.
A ceramic resonator as shown in Figure 1-4(a)
3.
An external resistor as shown in Figure 1-4(b)
4.
An external clock signal as shown in Figure 1-4(c)
The frequency, fOSC, of the oscillator or external clock source is divided by two to
produce the internal operating frequency, fOP. The type of oscillator is selected by
a mask option. An internal 2M
resistor may be selected between OSC1 and
OSC2/R by a mask option (crystal/ceramic resonator mode only).
If the RC oscillator option is selected, OSC1 pin should be connected to a known
logic level, either one or zero.
1.3.2.1
Crystal Oscillator
The circuit in Figure 1-4(a) shows a typical 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 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 internal start-up
resistor of approximately 2 M
is provided between OSC1 and OSC2/R for the
crystal type oscillator as a mask option.
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