參數(shù)資料
型號(hào): MC68HC705SR3CFB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 17/96頁
文件大?。?/td> 612K
代理商: MC68HC705SR3CFB
MOTOROLA
2-4
MC68HC05SR3
PIN DESCRIPTIONS
2
2.2.3
RC Oscillator Option
This conguration is intended to be the lowest cost option in applications where oscillator accuracy
is not important. An internal constant current source and a capacitor have been integrated on-chip,
connected between the OSC2 pin and VSS. Thus by either connecting a resistor to VDD from
OSC2 or by putting a wire strap between OSC1 and OSC2 self-oscillations at the frequency as
shown in Figure 2-2 and Figure 2-3 can be induced.
Figure 2-2 Typical Oscillator Frequency for Selected External Resistor
Figure 2-3 Typical Oscillator Frequency for Wire-Strap Connection
60
30
40
50
70
90
100
110
80
4.0
3.5
3.0
2.5
2.0
1.5
Resistance (K
)
Oscillator
F
requency
(MHz)
3.5
2.0
2.5
3.0
4.0
5.0
5.5
6.0
4.5
2.25
2.00
1.75
1.50
1.25
1.00
VDD (V)
Oscillator
F
requency
(MHz)
T=0
°C
T=25
°C
T=50
°C
TPG
22
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