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PUSHM
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Saving multiple registers
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PUSHM
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PUSH Multiple registers
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[Syntax]
PUSHM src-src2
[Operation]
signed char i;
for ( i = register_num(src2); i >= register_num(src); i-- ) {
tmp = register(i);
SP = SP - 4;
*SP = tmp;
}
[Function]
- | This instruction saves values to the stack from the block of registers in the range specified by src and src2. |
- | The range is specified by first and last register numbers. Note that the condition (first register number < last register number) must be satisfied. |
- | The stack pointer in use is specified by the U bit in the PSW. |
- | Registers are saved in the stack from R15 to R1. |
[Instruction Format]
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PUSHM src-src2
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Rs
Rs=R1R14
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Rs2
Rs2=R2R15
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[Flag Change]
- | This instruction does not affect the states of flags. |
[Description Example]
PUSHM R1-R3
PUSHM R4-R8