P89LPC935 Microcontroller Tutorial - gmitWEB

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Accessing Port Pins • The microcontroller port should be configured at the start of the program. //configure port 2 to be quasi bi-directional P2M1 = 0x00; P2M2 = 0x00; //all 8 pins are quasi bi-directional • Writing to an entire port P2 = 0x12; //Port 2 = 12H (00010010 binary) P2 &= 0xF0; //clear lower 4 bits of Port 2 P2 |= 0x03; //set P2.0 and P2.1 • Reading from a port unsigned char data status; status = P1; //read from Port 1 Diploma Project <strong>Tutorial</strong> 24
Example Code (3) //Program to read from 8 switches connected to Port 1. The status of the switches //is written to 8 LEDs connected to Port 2. #include //SFR address definitions void main() { unsigned char data status; //variable to hold switch status P1M1 = 0xFF; P1M2 = 0; //port 1 is input P2M1 = 0; P2M2 = 0xFF; //port 2 is output } //continuous loop to read switches and display the status while(1) { status = P1; P2 = status; } Diploma Project <strong>Tutorial</strong> 25
Page 1 and 2: P89LPC935 Microcontroller Tutorial
Page 3 and 4: MCB900 Features • RS232 driver pr
Page 5 and 6: P89LPC935 Microcontroller Advanced
Page 7 and 8: Memory Organisation • The 8051 ar
Page 9 and 10: Input/Output Ports • P89LPC935 is
Page 11 and 12: Input/Output Ports • P89LPC935 is
Page 13 and 14: Input/Output Port Configuration •
Page 15 and 16: Interfacing Outputs to 5V Logic •
Page 17 and 18: 89LPC935 Clock • A machine cycle
Page 19 and 20: Keil C51 Cross Compiler • ANSI C
Page 21 and 22: C51 Memory Types • Memory type ex
Page 23: Example Code (2) //program to add 2
Page 27 and 28: Example Code (4) //program to flash
Page 29 and 30: Generating Delays (2) • Use assem
Page 31 and 32: Using Timer 0 to Generate a Delay /
Page 33: Example Project • Keyless Doorloc

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