Alu - Analog Devices adsp-2100 Manual

Syntax:
[ IF cond ]
Permissible xops
AX0 MR2
AX1 MR1
AR MR0
SR1
SR0
Permissible constants (ADSP-217x, ADSP-218x, ADSP-21msp58/59 only)
0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32767
–2, –3, –5, –9, –17, –33, –65, –129, –257, –513, –1025, –2049, –4097, –8193, –16385, –
32768
Example:
IF EQ AR = AX0 + AY0 + C;
AR = AR + 512;
Description:
Test the optional condition and, if true, perform the specified
addition. If false then perform a no-operation. Omitting the condition
performs the addition unconditionally. The addition operation adds the first
source operand to the second source operand along with the ALU carry bit,
AC, (if designated by the "+C" notation), using binary addition. The result is
stored in the destination register. The operands are contained in the data
registers or constant specified in the instruction.
The xop + constant operation is only available on the ADSP-217x, ADSP-218x,
and ADSP-21msp58/59 processors and may not be used in multifunction
instructions.
Status Generated:
ASTAT: 7 6
SS MV AQ AS
– –
AZ Set if the result equals zero. Cleared otherwise.
AN Set if the result is negative. Cleared otherwise.
AV Set if an arithmetic overflow occurs. Cleared otherwise.
AC Set if a carry is generated. Cleared otherwise.
AR = xop
AF
Permissible yops
AY0
AY1
AF
5 4 3
AC AV AN AZ
– – *
(instruction continues on next page)
ADD / ADD with CARRY
+ yop
+ C
+ yop + C
+ constant
+ constant + C
Permissible conds (see Table 15.9)
EQ LE
NE NEG
GT POS
GE AV
LT NOT AV NOT CE
2 1 0
* * *

ALU

;
AC
NOT AC
MV
NOT MV
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