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Add to Accumulator With Sign Extension Suppressed
ADDS
7-29
Assembly Language Instructions
Syntax ADDS
dma
Direct addressing
ADDS
ind
[, AR
n
] Indirect addressing
Operands dma: 7 LSBs of the data-memory address
n: Value from 0 to 7 designating the next auxiliary register
ind: Select one of the following seven options:
* *+ *– *0+ *0– *BR0+ *BR0–
ADDS
dma
1514131211109876543210
0
11000100 dma
ADDS
ind
[, AR
n
]
1514131211109876543210
0
11000101 ARU N NAR
Note: ARU, N, and NAR are defined in Section 6.3,
Indirect Addressing Mode
(page 6-9).
Execution Increment PC, then ...
(ACC) + (data-memory address) → ACC
Status Bits
Affected by Affects
OVM C and OV
This instruction is not affected by SXM.
Description The contents of the specified data-memory location are added to the accumu-
lator with sign extension suppressed. The data is treated as an unsigned 16-bit
number, regardless of SXM. The accumulator contents are treated as a signed
number. Note that ADDS produces the same results as an ADD instruction
with SXM = 0 and a shift count of 0.
The carry bit is set (C = 1) if the result of the addition generates a carry and
is cleared (C = 0) if it does not generate a carry.
Words 1
Cycles for a Single ADDS Instruction
Program
Operand ROM DARAM SARAM External
DARAM 1 1 1 1+p
SARAM 1 1 1, 2
†
1+p
External 1+d 1+d 1+d 2+d+p
†
If the operand and the code are in the same SARAM block
Opcode
Cycles