参数资料
型号: MC68HC05SR3FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 17/96页
文件大小: 3143K
代理商: MC68HC05SR3FB
Freescale
2-4
MC68HC05SR3
PIN DESCRIPTIONS
2
2.2.3
RC Oscillator Option
This configuration 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)
O
scill
ator
Frequen
cy
(M
Hz)
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
(M
Hz)
T=0°C
T=25°C
T=50°C
TPG
22
05SR3.Book Page 4 Thursday, August 4, 2005 1:08 PM
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