ENTER - Make Stack Frame (80188+)
Usage: ENTER locals,level
Modifies Flags: None
Modifies stack for entry to procedure for high level language. Operand "locals" specifies the amount of storage to be allocated on the stack. "Level" specifies the nesting level of the routine. Paired with the LEAVE instruction, this is an efficient method of entry and exit to procedures.
| Clocks | ||||
|---|---|---|---|---|
| operands | 286 | 386 | 486 | Size Bytes |
| immed16,0 | 11 | 10 | 14 | 4 |
| immed16,1 | 15 | 12 | 17 | 4 |
| immed16,immed8 | 12+4(n-1) | 15+4(n-1) | 17+3n | 4 |
ESC - Escape
Usage: ESC immed,src
Modifies Flags: None
Provides access to the data bus for other resident processors. The CPU treats it as a NOP but places memory operand on bus.
| Clocks | ||||
|---|---|---|---|---|
| operands | 286 | 386 | 486 | Size Bytes |
| immed,reg | 9-20 | ? | ? | 2 |
| immed,mem | 9-20 | ? | ? | 2-4 |
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