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X-Hacker.org- TMS320C2x DSP - syntax [<label>] zac
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SYNTAX [<LABEL>] ZAC
OPERANDS None
EXECUTION (PC) + 12 . PC
0 . ACC
DESCRIPTION The contents of the accumulator are replaced with zero. The
ZAC instruction has been implemented as a special case of LACK
(ZAC assembles as LACK 0).
WORDS 1
ENCODING 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+-----------------------------------------------+
|1 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 |
+-----------------------------------------------+
CYCLES
+------------------------------------------------+
| Cycle Timings for a Single Instruction |
|------------------------------------------------|
| PI/DI | PI/DE | PE/DI | PE/DE | PR/DI | PR/DE |
|-------+-------+-------+--------+-------+-------|
'20 | 1 | 1 | 1+p | 1+p | - | - |
|-------+-------+-------+--------+-------+-------|
'C25 | 1 | 1 | 1+p | 1+p | 1 | 1 |
|------------------------------------------------|
| Cycle Timings for a Repeat Instruction |
|------------------------------------------------|
'20 | not repeatable | - | - |
|------------------------------------------------|
'C25 | not repeatable |
+------------------------------------------------+
EXAMPLE ZAC
BEFORE AFTER
ACC X >A5A5A5A5 ACC X >0
C C
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