Table of Contents
Advertisement
[Encoding]
0 0 0 1
Hex Code in:
Binary Mode = [A5][Encoding]
Source Mode = [Encoding]
Operation:
DEC
(WRj) ← (WRj) – #short
DEC DRk,#short
Binary Mode
Bytes:
States:
[Encoding]
0 0 0 1
Hex Code in:
Binary Mode = [A5][Encoding]
Source Mode = [Encoding]
Operation:
DEC
(DRk) ← (DRk) – #short
DIV <dest>,<src>
Function:
Divide
Description:
Divides the unsigned integer in the register by the unsigned integer operand in register
addressing mode and clears the CY and OV flags.
For byte operands (<dest>,<src> = Rmd,Rms) the result is 16 bits. The 8-bit quotient is
stored in the higher byte of the word where Rmd resides; the 8-bit remainder is stored in the
lower byte of the word where Rmd resides. For example: Register 1 contains 251 (0FBH or
11111011B) and register 5 contains 18 (12H or 00010010B). After executing the instruction
DIV R1,R5
register 1 contains 13 (0DH or 00001101B); register 0 contains 17 (11H or 00010001B),
since 251 = (13 X 18) + 17; and the CY and OV bits are clear (see Flags).
Flags:
The CY flag is cleared. The N flag is set if the MSB of the quotient is set. The Z flag is set if
the quotient is zero.
CY
0
Exception: if <src> contains 00H, the values returned in both operands are undefined; the
CY flag is cleared, OV flag is set, and the rest of the flags are undefined.
CY
0
1 0 1 1
Source Mode
3
2
5
4
1 0 1 1
AC
—
AC
—
INSTRUCTION SET REFERENCE
t t t t
0 1
u u u u
1 1
OV
N
OV
N
1
?
v v
v v
Z
Z
?
A-55
Advertisement
Table of Contents
