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参数资料
| 型号： | MSM80C85AHGS-2K |
| 厂商： | LAPIS SEMICONDUCTOR CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 5 MHz, MICROPROCESSOR, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 32/32页 |
| 文件大小： | 355K |
| 代理商： | MSM80C85AHGS-2K |
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8
Semiconductor
MSM80C85AHRS/GS/JS
DRIVING THE X1 AND X2 INPUTS
You may drive the clock inputs of the MSM80C85AH with a crystal, or an external clock source.
The driving frequency must be at least 1 MHz, and must be twice the desired internal clock
frequency; hence, the MSM80C85AH is operated with a 6 MHz crystal (for 3 MHz clock). If a
crystal is used, it must have the following characteristics:
Parallel resonance at twice the clock frequency desired
CL (load capacitance) 30 pF
CS (shunt capacitance) 7 pF
RS (equivalent shunt resistance) 75 ohms
Drive level: 10 mW
Frequency tolerance:
±0.05% (suggested)
Note the use of the capacitors between X1, X2 and ground. These capacitors are required to
assure oscillator startup at the correct frequency.
Figure 4 shows the recommended clock driver circuits. Note in B that a pull-up resistor is
required to assure that the high level voltage of the input is at least 4 V.
For driving frequencies up to and including 6 MHz you may supply the driving signal to X, and
leave X2 open-circuited (Figure 4B). To prevent self-oscillation of the MSM80C85AH, be sure
that X2 is not coupled back to X1 through the driving circuit.
Note:
Since the constant values may vary depending on oscillator, consult the manufacturer
of the oscillator used when designing a circuit.
Figure 4 Clock Driver Circuits
X1
CINT = 15 pF
X2
C1
C2
X1
X2
* X2 Left Floating
VIH > 0.8 VCC
High time > 40 ns
Low time > 40 ns
33 pF Capacitor required for crystal frequency 10 to 6.25 MHz
50 pF Capacitor required for crystal frequency 6.25 to 4 MHz
100 pF Capacitor required for crystal frequency <4 MHz
MSM80C85AH
A. Quartz Crystal Clock Driver
B. 1 - 10 MHz Input Frequency External
Clock Drive Circuit
*
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MSM80C85AHJS | 制造商:ROHM Semiconductor 功能描述: |
| MSM80C85AHRS | 制造商:OK International 功能描述: 制造商:ROHM Semiconductor 功能描述:8bit,CMOS MCU 制造商:ROHM Semiconductor 功能描述:8-bit CMOS microcontroller |
| MSM80C85ARS | 制造商:OK International 功能描述: 制造商:Panasonic Industrial Company 功能描述:IC |
| MSM80C86A-10GS | 制造商:OKI 制造商全称:OKI electronic componets 功能描述:16-Bit CMOS MICROPROCESSOR |
| MSM80C86A-10JS | 制造商:OKI 制造商全称:OKI electronic componets 功能描述:16-Bit CMOS MICROPROCESSOR |
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