Program Flow; Jump - Analog Devices adsp-2100 Manual

Syntax:
[ IF cond ] JUMP
Permissible conds (see Table 15.9)
EQ NE
LE NEG
AC NOT AC
Example:
IF NOT CE JUMP top_loop;
Description:
Test the optional condition and, if true, perform the
specified jump. If the condition is not true then perform a no-operation.
Omitting the condition performs the jump unconditionally. The JUMP
instruction causes program execution to continue at the effective address
specified by the instruction. The addressing mode may be direct or
register indirect.
For direct addressing (using an immediate address value or a label), the
program address is stored directly in the instruction word as a full 14-bit
field. For register indirect jumps, the selected I register provides the
address; it is not post-modified in this case.
If JUMP is the last instruction inside a DO UNTIL loop, you must ensure
that the loop stacks are properly handled. If NOT CE is used as the
condition, execution of the JUMP instruction decrements the processor's
counter (CNTR register).
Status Generated:
Instruction Field:
Conditional JUMP Direct Instruction Type 10:
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 1 1
Conditional JUMP Indirect Instruction Type 19:
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 1
I specifies the I register (Indirect Address Pointer).
ADDR: immediate jump address
GT GE
POS AV
MV NOT MV
None affected.
0 ADDR
0 1 1 0 0 0

PROGRAM FLOW

(I4) ;
(I5)
(I6)
(I7)
<addr>
LT
NOT AV
NOT CE
{CNTR is decremented}
0 0 0 0 0 I 0 0
COND: condition
15

JUMP

COND
COND
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