AT80251G2D-3CSUM(2006) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT80251G2D-3CSUM
(Rev.:2006)

8/16-bit Microcontroller with Serial Communication Interfaces

Atmel Corporation 

AT/TSC8x251G2D

Table 24. Summary of Multiply, Divide and Decimal-adjust Instructions

MultiplyMUL AB(B:A) ← (A)×(B)

MUL <dest>, <src>extended dest opnd ← dest opnd × src opnd

DivideDIV AB(A) ← Quotient ((A) ⁄ (B))

(B) ← Remainder ((A) ⁄ (B))

DivideDIV <dest>, <src>ext. dest opnd high ← Quotient (dest opnd ⁄ src opnd)

ext. dest opnd low ← Remainder (dest opnd ⁄ src opnd)

Decimal-adjust ACCDA AIF [[(A)3:0 > 9] ∨ [(AC) = 1]]

for Addition (BCD) THEN (A)3:0 ← (A)3:0 + 6 !affects CY;

IF [[(A)7:4 > 9] ∨ [(CY) = 1]]

THEN (A)7:4 ← (A)7:4 + 6

Mnemonic

<dest>,

<src>(1)

Comments

Binary Mode Source Mode

Bytes States Bytes States

AB

Multiply A and B

1

5

1

5

MUL

Rmd, Rms Multiply byte register and byte register

3

6

2

5

WRjd, WRjs Multiply word register and word register

3

12

2

11

AB

Divide A and B

1

10

1

10

DIV

Rmd, Rms Divide byte register and byte register

3

11

2

10

WRjd, WRjs Divide word register and word register

3

21

2

20

DA

A

Decimal adjust ACC

1

1

1

1

Note: 1. A shaded cell denotes an instruction in the C51 Architecture.

29

4135F–8051–11/06

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