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Instruction Set

3.4.6.16 DADD

DADD[.W] Source and carry added decimally to destination

DADD.B Source and carry added decimally to destination

Syntax DADD src,dst or DADD.W src,dst

DADD.B src,dst

Operation src + dst + C → dst (decimally)

Description The source operand and the destination operand are treated as four binary coded

decimals (BCD) with positive signs. The source operand and the carry bit (C)are added

decimally to the destination operand. The source operand is not affected. The previous

contents of the destination are lost. The result is not defined for non-BCD numbers.

Status Bits N: Set if the MSB is 1, reset otherwise

Z: Set if result is zero, reset otherwise

C: Set if the result is greater than 9999

Set if the result is greater than 99

V: Undefined

Mode Bits OSCOFF, CPUOFF, and GIE are not affected.

Example The eight-digit BCD number contained in R5 and R6 is added decimally to an eight-digit

BCD number contained in R3 and R4 (R6 and R4 contain the MSDs).

CLRC ; clear carry

DADD R5,R3 ; add LSDs

DADD R6,R4 ; add MSDs with carry

JC OVERFLOW ; If carry occurs go to error handling routine

Example The two-digit decimal counter in the RAM byte CNT is incremented by one.

CLRC ; clear carry

DADD.B #1,CNT

SETC

DADD.B #0,CNT ; equivalent to DADC.B CNT

SLAU144J–December 2004–Revised July 2013 CPU

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