Keil C51 Cross Compiler - gmitWEB

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Question • What is the value of variable x after the following code executes? unsigned char data x; x = 21; x &= 0xF0; x |= 0x03; • Write C code to set the upper 4 bits of a char to “1100”. Embedded Systems 2 2 - 16 C Programming
C Logical Operators • Bitwise operators will change certain bits within a variable • Logical operators produce a true or false answer – They are used for looping and branching conditions • C Logical Operators – AND && – OR || – Equals = = – Not Equal != – Less < – Less or Equal – Greater or Equal >= Embedded Systems 2 2 - 17 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: C Bitwise Operators • NOT ~ char
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 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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