Keil C51 Cross Compiler - gmitWEB

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C51 Data Types † = extension to ANSI C Embedded Systems 2 2 - 4 C Programming
C51 Memory Models • Small – All variables stored in internal data memory • Be careful – stack is placed here too – Generates the fastest, most efficient code – Default model for Keil uVision Projects • Compact – All variables stored in 1 page (256 bytes) of external data memory – Accessed using MOVX @R0 – Slower than small model, faster than large model • Large – All variables stored in external data memory (up to 64KByte) – Accessed using MOVX @DPTR – Generates more code than small or compact models Embedded Systems 2 2 - 5 C Programming
Page 1 and 2: Keil C51 Cross Compiler • ANSI C
Page 3: C51 Keywords Embedded Systems 2 2 -
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 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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