JAN: Difference between revisions
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'''JAN''' is an assembly instruction. If the [[A register]] is negative (bit 15 = 1) | '''JAN''' is an assembly instruction. If the [[A register]] is negative (bit 15 = 1) it jumps the program execution to the address of the [[program counter]] (P register) plus the value of [[displacement]], which can be in the range -128 .. 127. Else it continues the program execution at (P) + 1. | ||
== References == | == References == | ||
Revision as of 13:29, 31 May 2010
| JAN | |
|---|---|
| Description | Jump if A negative |
| Format | JAN <disp.> |
| Code | 130 4008 |
| Affected | If A<0 (P):=(P)+Δ |
| Type | User |
| Architecture | ND-100, ND-110 |
JAN is an assembly instruction. If the A register is negative (bit 15 = 1) it jumps the program execution to the address of the program counter (P register) plus the value of displacement, which can be in the range -128 .. 127. Else it continues the program execution at (P) + 1.
References
- Norsk Data Document ND–06.014.02 ND-100 REFERENCE MANUAL Page 139
- Norsk Data Document ND–06.029.01 ND-110 Instruction Set Page 79