Keil C51 Cross Compiler - gmitWEB

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Software Delay Using a decrementing for loop will generate a DJNZ loop. Loop execution time = 204 machine cycles [1 + 1 + (100 *2) + 2] = 204usec for a 12MHz crystal. Change starting value to 98 to get a 200usec delay Embedded Systems 2 2 - 26 C Programming
Hardware Delay • Use timer 0 or timer 1 – Very efficient mechanism of producing accurate delays – Timer mode, control and counter registers must be configured – Timer run bit is used to start/stop the timer – The timer flag can be polled to determine when required time delay has elapsed – Using timer in interrupt mode uses very little CPU resources • See timer notes for more details Embedded Systems 2 2 - 27 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 and 20: Accessing Port Pins • Writing to
Page 21 and 22: Example Code (3) //Program to read
Page 23 and 24: Example Code (4) //program to flash
Page 25: Software Delay • Use a for loop -
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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