参数资料
型号: MC68HC08QY4CDWE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, LEAD FREE, PLASTIC, MS-013AA, SOIC-16
文件页数: 67/178页
文件大小: 2311K
代理商: MC68HC08QY4CDWE
Oscillator Characteristics
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
159
Figure 16-10. RC versus Frequency (5 Volts @ 25
°C)
AWU module, internal RC oscillator frequency
fINTRC
32
kHz
1. Bus frequency, fOP, is oscillator frequency divided by 4.
2. Value is deviation from 25°C and midpoint of voltage range. Factory trimming is done at @25°C and at voltage as specified
on customer ROM order form, for example 5.0V for 5V
± 10%, 3.0V for 1.8V to 3.6V device.
3. Values are based on characterization results, not tested in production.
4. No more than 10% duty cycle deviation from 50%.
5. When external oscillator clock is greater than 1MHz, ECFS1:ECFS0 must be 00 or 01
6. Use fundamental mode only, do not use overtone crystals or overtone ceramic resonators
7. Due to variations in electrical properties of external components such as, ESR and Load Capacitance, operation above
16 MHz is not guaranteed for all crystals or ceramic resonators. Operation above 16 MHz requires that a Negative Resis-
tance Margin (NRM) characterization and component optimization be performed by the crystal or ceramic resonator vendor
for every different type of crystal or ceramic resonator which will be used. This characterization and optimization must be
performed at the extremes of voltage and temperature which will be applied to the microcontroller in the application. The
NRM must meet or exceed 10x the maximum ESR of the crystal or ceramic resonator for acceptable performance.
8. Do not use damping resistor when ECFS1:ECFS0 = 01, 10 or 11
9. Consult crystal vendor data sheet.
Characteristic
Symbol
Min
Typ
Max
Unit
5V 25 oC
0
2
4
6
8
10
12
0
102030
405060
R
ext (k ohms)
RC
F
RE
Q
UE
NCY
,f RCCLK
(MHz)
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