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參數(shù)資料
| 型號： | EM78P267A |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-Bit Micro-Controller for Consumer Product(帶2K × 13片上ROM，工作電壓2.5V-5.5V的8位微控制器) |
| 中文描述： | 8位微控制器的消費產(chǎn)品（帶2K × 13片上ROM的，工作電壓為2.5V至5.5V的8位微控制器） |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 144K |
| 代理商： | EM78P267A |
* This specification are subject to be changed without notice.
EM78P267/467A/B/C
8-BIT MICRO-CONTROLLER FOR CONSUMER PRODUCT
18
Preliminary
9.5.1997
If MS=1, HLF=0 HLP=0 low XTAL type oscillator is chose, in this case the oscillator is in low power and low
frequency operation condition so the frequency should excess only 32.768 KHz and you got the bonus of low
current consumption.
If MS=1, HLF=1 HLP=1 high XTAL type oscillator is chose, at this situation the oscillator is in high speed
operation condition so the minim frequency should not less than 1 MHz. Because in this mode the current
consumption is large than low power mode which in low frequency operation or battery environment should take
into consideration.
In most case, the timing accuracy is not vary important. So the
“
RC oscillator
”
offers lots of cost savings. But the
RC oscillator frequency is a function of the supply voltage, the resistor ( Rext ), capacitor ( Cext ) values and the
operation temperature. In addition to, the oscillator frequency will vary little from unit to unit due to process
parameter variation.
We strongly suggest user should take into account the frequency variation due to tolerance of Rext. Cext values
and the voltage temperature effect.
Besides, furthermore stable consideration, the Cext should not less than 20pF and Rext should not great than 1M
Ohm. In such case the PCB trace capacitance, package lead frame capacitance and leakage current will become
frequency insensitive.
If the Rext become smaller the frequency become faster. However when Rext value less the 1K Ohm there may
occur unstable condition due to the NMOS can
’
t discharge the capacitance
’
s current correctly the user should
pay attention on it.
Internal
clock
OSCI
OSC2/CLKOUT
Fosc2/4.2
V
DD
Rext
Cext
V
SS
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