參數(shù)資料
型號(hào)： EM78Q156A
廠商： ELAN Microelctronics Corp .
英文描述： 8-Bit Micro-Controller for General-Purpose Product(工作電壓2.5V-6.5V的8位微控制器)
中文描述： 8位微控制器的通用產(chǎn)品（工作電壓為2.5V至6.5V的8位微控制器）
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 274K
代理商： EM78Q156A
* This specification are subject to be changed without notice.
EM78Q156A/B
8-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
16
6.30.1998
Preliminary
Oscillator
The EM78Q156A/B can be operated in there different oscillator options, three are RC type
low XTAL type
'
high
XTAL type. The user can program three option bits (MS, HLF, HLP) to select one of these three modes.
If MS=0
HLF=0
RC type oscillator is chosed and the frequency is determined by external Rext
'
Cext which
device can offer lots of cost saving in timing insensitive applications.
If MS=1
HLF=0
HLP=0
low XTAL type oscillator is chosed, in this case the oscillator is in low power and low
frequency operation condition so the maxim frequency should not excess 4 MHz and you got the bonus of low
current consumption.
If MS=1
HLF=1
HLP=1
high XTAL type oscillator is chosed, at this situation the oscillator is in high speed
operation condition so the minum frequency should not less than 1MHz. 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.
The typical operation speeds of Crystal are listed below :
Conditions
One cycles with two clocks
VDD (V)
2.5
3
5
6.5
2.5
3
5
6
2.5
3
5
6
2.5
3
5
6
Fxt max. (M)
3.58
4
12
17
3.84
5
15
17
8
10
28
33
9
11
31
36
Two cycles with two clocks
One cycles with four clocks
Two cycles with foue clocks
N
Internal
clock
OSC1
OSC2/CLKOUT
Fosc/4,2
V
SS
Cext
Rext
V
DD
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