Datasheet

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4.6.3.2 ADDX
ADDX.A Add source address-word to destination address-word
ADDX.[W] Add source word to destination word
ADDX.B Add source byte to destination byte
ADDX.A src,dst
Syntax
ADDX src,dst or ADDX.W src,dst
ADDX.B src,dst
Operation src + dst → dst
Description The source operand is added to the destination operand. The previous contents of the
destination are lost. Both operands can be located in the full address space.
Status Bits N: Set if result is negative (MSB = 1), reset if positive (MSB = 0)
Z: Set if result is zero, reset otherwise
C: Set if there is a carry from the MSB of the result, reset otherwise
V: Set if the result of two positive operands is negative, or if the result of two negative
numbers is positive, reset otherwise
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example Ten is added to the 20-bit pointer CNTR located in two words CNTR (LSBs) and
CNTR+2 (MSBs).
ADDX.A #10,CNTR ; Add 10 to 20-bit pointer
Example A table word (16-bit) pointed to by R5 (20-bit address) is added to R6. The jump to label
TONI is performed on a carry.
ADDX.W @R5,R6 ; Add table word to R6
JC TONI ; Jump if carry
... ; No carry
Example A table byte pointed to by R5 (20-bit address) is added to R6. The jump to label TONI is
performed if no carry occurs. The table pointer is auto-incremented by 1.
ADDX.B @R5+,R6 ; Add table byte to R6. R5 + 1. R6: 000xxh
JNC TONI ; Jump if no carry
... ; Carry occurred
Note: Use ADDA for the following two cases for better code density and execution.
ADDX.A Rsrc,Rdst
ADDX.A #imm20,Rdst
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SLAU144J–December 2004–Revised July 2013 CPUX
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