Keil C51 Cross Compiler - gmitWEB

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Reading 8051 Port Pins • We can only read the proper logic value of a pin if the latch contains a ‘1’. – If the latch contains a ‘0’ the FET is on and a ‘0’ will always be read. Embedded Systems 2 2 - 20 C Programming
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 } //continuous loop to read switches and display the status while(1) { status = P1; P2 = status; } Embedded Systems 2 2 - 21 C Programming
Page 1 and 2: Keil C51 Cross Compiler • ANSI C
Page 3 and 4: C51 Keywords Embedded Systems 2 2 -
Page 5 and 6: C51 Memory Models • Small - All v
Page 7 and 8: C51 Memory Types • Memory type ex
Page 9 and 10: C51 Memory Types • bdata - Bit ad
Page 11 and 12: Example Code (1) sbit input = P1^0;
Page 13 and 14: Wait Loops • In some applications
Page 15 and 16: C Bitwise Operators • NOT ~ char
Page 17 and 18: C Logical Operators • Bitwise ope
Page 19: Accessing Port Pins • Writing to
Page 23 and 24: Example Code (4) //program to flash
Page 25 and 26: Software Delay • Use a for loop -
Page 27 and 28: Hardware Delay • Use timer 0 or t
Page 29 and 30: Re-entrant Functions • A re-entra
Page 31 and 32: Function Parameter Passing • Up t
Page 33 and 34: Interrupt Functions • Interrupt v
Page 35: C51 Pointers • Generic pointers -

Keil C51 Cross Compiler - gmitWEB

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