資料來源:https://www.sparkfun.com/products/540
Standard ‘Watch’ or Real-Time-Clock crystal. 32.768kHz means it is precisely half of a 16-bit counter. Start counting at 0x8000 (or 32768). When the counter rolls over from 65535 to 0, then you know that exactly one second has passed. Reset the interrupt, reset the counter, and start counting again! Rated at 12.5pF load capacitance, 35K ohm max (18K ohm typical) series resistance, and +/- 20ppm stability. Small cylinder package.
標準的'觀察'或實時時鐘晶體。 32.768kHz的意思恰恰是一個16位計數器的一半。在開始為0x8000(或32768)計數。當計數器從65535到0翻轉,那麼你知道,只有一個第二個有過去。復位中斷,重置計數器,並重新開始計數!在12.5pF的負載電容額定,35K歐姆最大(18K歐姆典型值)串聯電阻和20ppm的+/-穩定。小圓柱包裝。