Abstract: This application describes how to interface a DS1302 RTC using the 3-wire interface to an 8051-type microcontroller. The example includes a schematic and example software written in C. DS1302 Pin Assignment Description This application note demonstrates how to interface a DS1302 real-time clock to an 8051-type microcontroller and provides example code showing basic interface routines. The microcontroller used in this example is the DS2250, and the software is written in C. Operation The program uses three general-purpose port pins on the microcontroller to control the 3-wire synchronous bus. The microcontroller initiates a data transfer by sending a command byte to the DS1302. The microcontroller then sends additional data and/or SCLKs to the DS1302, which transmits or receives data based upon the command byte. The software is shown in Figure 1. A schematic of the circuit is shown in Figure 2. Figure 1. Program Listing (Download ZIP file) For Larger Image Figure 2. Schematic of DS1302 RTC. 관련 부품   APP 3449: Feb 21, 2005 DS1302 트리클 충전 타임키핑 칩 전체 데이터 시트 (PDF, 348kB) 무료 샘플 자동 업데이트 관심 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트를 원하십니까? 그렇다면 EE-Mail™을 신청하십시오. We Want Your Feedback! 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오.   다운로드, PDF 형식 (20kB)  AN3449, AN 3449, APP3449, Appnote3449, Appnote 3449