Computer Hardware User's Guide

Add Integer ADDI
13-57 Assembly Language Instructions
Syntax ADDI src, dst
Operation dst + src → dst
Operands src general addressing modes (G):
0 0 any CPU register
0 1 direct
1 0 indirect (disp = 0–255, IR0, IR1)
1 1 immediate
dst any CPU register
Opcode
31 2423 16 8 7 015
0000001 G
srcdst 00
Description The sum of the dst and src operands is loaded into the the dst register. The
dst and src operands are assumed to be signed integers.
Cycles 1
Status Bits These condition flags are modified only if the destination register is R7–R0.
LUF Unaffected
LV 1 if an integer overflow occurs; unchanged otherwise
UF 0
N 1 if a negative result is generated; 0 otherwise
Z 1 if a 0 result is generated; 0 otherwise
V 1 if an integer overflow occurs; 0 otherwise
C 1 if a carry occurs; 0 otherwise
OVM Operation is affected by OVM bit value.
Example ADDI R3,R7
Before Instruction After Instruction
R3 00 FFFF FFCB R3 00 FFFF FFCB
R7 35 R7 00 0000 0000
LUF 0 LUF 0
LV 0 LV 0
UF 0 UF 0
N 0 N 0
Z 0 Z 0
V 0 V 0
C 0 C 0
–53
53
–53
Mode Bit