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請(qǐng)教9200問(wèn)題 |
| 作者:huai903 欄目:ARM技術(shù) |
本人是這樣打算的:TWI讀寫EEPROM(AT24C512)放bootloader,片外FLASH放application,加SDRAM和有源晶振、復(fù)位芯片、9200、DC-DC做最小系統(tǒng),不知有沒(méi)有意義,如果可以要注意些什么。 另對(duì)9200data sheet 有句話不是太懂,敬請(qǐng)指點(diǎn): Main Oscillator Bypass The user can input a clock on the DEVICE instead of connecting a crystal.in this case,the user has to provide the external clock signal on the XIN.The programmer has to be sure not to modify the MOSCEN bit in the Main Oscillator Register.This bit must remain at 0,its reset VALUE,for the external clock to operate properly.While this bit is at 0,the pin XIN is pulled down by a 500 k RESISTOR in parallel with a 25 pF CAPACITOR. |
| 2樓: | >>參與討論 |
| 作者: huai903 于 2005/4/22 18:58:00 發(fā)布:
24C512太大了點(diǎn)吧 |
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| 3樓: | >>參與討論 |
| 作者: ztme 于 2005/4/22 19:40:00 發(fā)布:
外接時(shí)鐘 談的是外接時(shí)鐘信號(hào),不用芯片的內(nèi)部時(shí)鐘 |
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| 4樓: | >>參與討論 |
| 作者: huai903 于 2005/4/22 21:47:00 發(fā)布:
謝謝你啊,能更細(xì)一點(diǎn)嗎 我主要是說(shuō)這句話的:While this bit is at 0,the pin XIN is pulled down by a 500 k RESISTOR in parallel with a 25 pF CAPACITOR. 還有這個(gè)描述是針對(duì)有源時(shí)鐘之類的吧,對(duì)一般晶體(無(wú)源晶振)一樣嗎? |
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