P89LPC935 Microcontroller Tutorial - gmitWEB

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C51 Data Types Data Type Bits Range bit 1 0,1 unsigned char 8 0 to 255 signed char 8 -128 to +127 unsigned int 16 0 to 65535 signed int 16 -32768 to +32767 unsigned long 32 0 to 4294967296 signed long 32 -2147483648 to + 2147483647 sbit 1 0,1 Diploma Project <strong>Tutorial</strong> 20
C51 Memory Types • Memory type extensions allow access to all 8051 memory types. – A variable may be assigned to a specific memory space • code – Program memory. – unsigned char code const1 = 0x55; //define a constant – char code string1[] = “hello”; //define a string • data – Lower 128 bytes of internal data memory – unsigned int data x; //16-bit variable x • idata – All 256 bytes if internal data memory • bdata – Bit addressable area of internal data memory • xdata – External data memory (512 bytes of on-chip auxiliary data RAM) Diploma Project <strong>Tutorial</strong> 21
Page 1 and 2: P89LPC935 Microcontroller Tutorial
Page 3 and 4: MCB900 Features • RS232 driver pr
Page 5 and 6: P89LPC935 Microcontroller Advanced
Page 7 and 8: Memory Organisation • The 8051 ar
Page 9 and 10: Input/Output Ports • P89LPC935 is
Page 11 and 12: Input/Output Ports • P89LPC935 is
Page 13 and 14: Input/Output Port Configuration •
Page 15 and 16: Interfacing Outputs to 5V Logic •
Page 17 and 18: 89LPC935 Clock • A machine cycle
Page 19: Keil C51 Cross Compiler • ANSI C
Page 23 and 24: Example Code (2) //program to add 2
Page 25 and 26: Example Code (3) //Program to read
Page 27 and 28: Example Code (4) //program to flash
Page 29 and 30: Generating Delays (2) • Use assem
Page 31 and 32: Using Timer 0 to Generate a Delay /
Page 33: Example Project • Keyless Doorloc

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