Wang Wei, Sun Yongjian, Design of Stopwatch based on STC89C52 Single Chip Microcomputer, Journal of Current Scientific Research, Volume 1, Issue 4, 2022, Pages 1-8, ISSN 2766-8681, https://doi.org/10.14302/issn.2766-8681.jcsr-22-4126.
(http://oap-journals.infojcsr/article/1790)
Keywords: Microcomputer; LED; Proteus