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hey, hi to all In 8051 based microcontroller Is it necessary to write 0xFF if i want to use P1,P2,P3 port as input port? If yes then can i change the port I/O configuration in program anytime?
I could answer this question, but to what purpose, you would be back with another basic question 10 minutes later. Read "the bible" and, when you are reasonably familiar with it, continue you efforts. Erik here are the links to "the bible" Chapter 1 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_ARCH_1.pdf chapter 2 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_PROG_GUIDE_1.pdf chapter 3 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_HARDWARE_1.pdf