INSTRUCTION SET REFERENCE
6-75
6
6.2.40
modac
Mnemonic:
modac
Modify AC
Format:
modac
mask,
src,
dst
reg/lit
reg/lit
reg
Description:
Reads and modifies the AC register. src contains the value to be placed in the
AC register; mask specifies bits that may be changed. Only bits set in mask
are modified. Once the AC register is changed, its initial state is copied into
dst.
Action:
temp = AC;
AC = (src & mask) | (AC & ~mask);
dst = temp;
Faults:
STANDARD
Refer to
section 6.1.6, “Faults” (pg. 6-5)
.
Example:
modac g1, g9, g12
# AC
=
g9, masked by g1.
# g12
=
initial value of AC.
Opcode:
modac
645H
REG
See Also:
modpc, modtc
Side Effects:
Sets the condition code in the arithmetic controls.
Содержание i960 Jx
Страница 1: ...Release Date December 1997 Order Number 272483 002 i960 Jx Microprocessor Developer s Manual ...
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Страница 25: ...1 INTRODUCTION ...
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Страница 35: ...2 DATA TYPES AND MEMORY ADDRESSING MODES ...
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Страница 47: ...3 PROGRAMMING ENVIRONMENT ...
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Страница 73: ...4 CACHE AND ON CHIP DATA RAM ...
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Страница 85: ...5 INSTRUCTION SET OVERVIEW ...
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Страница 111: ...6 INSTRUCTION SET REFERENCE ...
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Страница 195: ...INSTRUCTION SET REFERENCE 6 83 6 Opcode mov 5CCH REG movl 5DCH REG movt 5ECH REG movq 5FCH REG See Also LOAD STORE lda ...
Страница 233: ...7 PROCEDURE CALLS ...
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Страница 257: ...8 FAULTS ...
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Страница 291: ...9 TRACING AND DEBUGGING ...
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Страница 309: ...10 TIMERS ...
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Страница 325: ...11 INTERRUPTS ...
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Страница 369: ...12 INITIALIZATION AND SYSTEM REQUIREMENTS ...
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Страница 413: ...13 MEMORY CONFIGURATION ...
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Страница 429: ...14 EXTERNAL BUS ...
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Страница 469: ...15 TEST FEATURES ...
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Страница 493: ...A CONSIDERATIONS FOR WRITING PORTABLE CODE ...
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Страница 503: ...B OPCODES AND EXECUTION TIMES ...
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Страница 515: ...C MACHINE LEVEL INSTRUCTION FORMATS ...
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Страница 523: ...D REGISTER AND DATA STRUCTURES ...
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Страница 551: ...GLOSSARY ...
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Страница 561: ...INDEX ...
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