The 8051 Instruction Set
Atmel 8051 Microcontrollers Hardware Manual 1-36
4316B–8051–02/04
1.14.14 DIVAB
Function: Divide
Description: DIV AB divides the unsigned eight-bit integer in the Accumulator by the unsigned eight-bit integer in register B.
The Accumulator receives the integer part of the quotient; register B receives the integer remainder. The carry
and OV flags are cleared.
Exception: if B had originally contained 00H, the values returned in the Accumulator and B-register are
undefined and the overflow flag are set. The carry flag is cleared in any case.
Example: The Accumulator contains 251 (0FBH or 11111011B) and B contains 18 (12H or 00010010B). The following
instruction,
DIV AB
leaves 13 in the Accumulator (0DH or 00001101B) and the value 17 (11H or 00010001B) in B, since
251 = (13 x 18) + 17. Carry and OV are both cleared.
Bytes: 1
Cycles: 4
Encoding: 10000100
Operation: DIV
(A)
15-8
← (A)/(B)
(B)
7-0
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