Asks the AT89S52 advertisement lamp to control the assembly language
I have already done so.It is not enough to do so. Using the P0 and the pull-up resistor is difficult to use P3 port second, you need at least 6 LEDs, accounted for six, use the button to adjust the buzzer at least 3 of the 9 digital display;
Is it?Yes, without using it, I have not used 244, and I checked 2442.8, three state buffer 164 or 595 is a serial input and output of the original, mainly used to make up for microcontroller I / O ports inadequate.
at least 8 ports (no choice). In this case, you can use the serial port to control 74LS164 (or 595) to control the digital display (595 online), which saves a lot of traffic.
