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PJRC Store 8051 Dev Board, $79 LCD 20x2 Display, $11 Serial Cable, $5 12 Volt Power, $8 More Components... 8051 Tools Main Page Software PAULMON Monitor Development Board Code Library Serial I/O, Polled Automatic Baud Rate Serial I/O, Intr. Lexer Random Numbers Serial EEPROM AMD 28F256 Flash Xilinx 3000 IDE Hard Drive Tiny Basic 89C2051 Programmer Other Resources

Pseudo Random Number Generator

No routine analogous to srand() is provided, but it is easily implemented by writing the seed value into the memory which holds the previously generated number. These routines check for zero (the illegal value), so it is not necessary to initialize the memory with a seed value unless a predictable starting seed is required or a truely random number is available.

RAND8

Generate an 8 bit pseudo random number, from 1 to 255. The number is returned in Acc.

RAND16

Generate a 16 bit pseudo random number, from 1 to 65535. The number is returned in Acc (lsb) and B (msb).