Keil C51 Cross Compiler - gmitWEB

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<strong>C51</strong> Memory Types • code – Program memory (internal or external). – unsigned char code const1 = 0x55; //define a constant – char code string1[] = “hello”; //define a string • data – Lower 128 bytes of internal data memory – Accessed by direct addressing (fastest variable access) – unsigned int data x; //16-bit variable x • idata – All 256 bytes of internal data memory (8052 micro) – Accessed by indirect addressing (slower) Embedded Systems 2 2 - 8 C Programming
<strong>C51</strong> Memory Types • bdata – Bit addressable area of internal data memory (addresses 20H to 2FH) – Allows data types that can be accessed at the bit level – unsigned char bdata status; – sbit flag1 = status^0; • xdata – External data memory – Slower access than internal data memory – unsigned char xdata var1; Embedded Systems 2 2 - 9 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: C51 Memory Types • Memory type ex
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 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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