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參數(shù)資料
| 型號： | MC68HC05K3CSD |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 18/69頁 |
| 文件大?。?/td> | 1383K |
| 代理商： | MC68HC05K3CSD |
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General Description
Functional Pin Description
MC68HC05K3 — Rev. 5
Technical Data
MOTOROLA
General Description
25
1.7.2.3 2-Pin RC Oscillators
The 2-pin RC oscillator configuration can be used for very low-cost
applications. With this option, a resistor must be connected between the
two oscillator pins and a capacitor must be connected from the OSC1 pin
square wave and the signal on the OSC1 pin approximates a triangular
wave.
The 2-pin RC oscillator is optimized for operation at 500 kHz. This
oscillator can be used at higher or lower frequencies with degraded
accuracy over temperature, supply voltage, and/or device processing
variations. The internal startup resistor of approximately 2 M
is not
connected between OSC1 and OSC2 when the 2-pin RC oscillator mask
option is selected.
1.7.2.4 3-Pin RC Oscillator
Another low cost, but more accurate, type of RC oscillator is the 3-pin
configuration utilizing the PB1/OSC3 pin. With this option, a resistor
must be connected between the OSC1 and OSC2 pins and a capacitor
must be connected between the OSC1 and PB1/OSC3 pins, as shown
in Figure 1-5(c). This 3-pin RC oscillator is more accurate than the 2-pin
RC oscillator with respect to temperature, supply voltage, and/or device
processing variations. The signal on the OSC2 and PB1/OSC3 pins is a
square wave and the signal on the OSC1 pin approximates a triangular
wave.
The 3-pin RC oscillator is optimized for operation at 500 kHz. This
oscillator can be used at higher or lower frequencies with degraded
accuracy over temperature, supply voltage, and/or device processing
variations. The internal startup resistor of approximately 2 M
is not
connected between OSC1 and OSC2 when the 3-pin RC oscillator mask
option is selected. The typical external components for a 500-kHz
oscillator are a 20-k
resistor and a 25- to 30-pF capacitor.
NOTE:
Capacitors used with the RC oscillators should have minimal leakage.
Electrolytic or tantalum capacitors should not be used because they
degrade the temperature performance of the oscillator due to excessive
variation in their leakage.
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