Difference between revisions of "HLT"
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<tr><td>Addressing Mode</td><td>[[Implied Mode|Implied]]</td></tr> | <tr><td>Addressing Mode</td><td>[[Implied Mode|Implied]]</td></tr> | ||
</table><br/> | </table><br/> | ||
| − | The Halt (HLT) instruction halts the [[CP1610]]. The CPU performs no further processing | + | The Halt (HLT) instruction halts the [[CP1610]]. The CPU asserts its HALT output, and performs no further processing once it executes this instruction. The CPU ignores interrupts as well until the CPU gets reset. HLT is mainly useful for debugging.<br/><br/> |
| − | + | A pulse on the STPST input will restart a halted CPU. On the Intellivision, this is mostly irrelevant as STPST tied to a fixed value. The CPU is socketed, however, so one could modify their Intellivision in order to make this useful. | |
Revision as of 01:49, 24 January 2005
| Instruction Name | Halt |
| Mnemonic | HLT |
| CP1610 Clock Cycles | Infinity |
| Interruptible | No |
| Opcode Range | $0000 |
| Input Flags | None |
| Output Flags | None |
| Addressing Mode | Implied |
The Halt (HLT) instruction halts the CP1610. The CPU asserts its HALT output, and performs no further processing once it executes this instruction. The CPU ignores interrupts as well until the CPU gets reset. HLT is mainly useful for debugging.
A pulse on the STPST input will restart a halted CPU. On the Intellivision, this is mostly irrelevant as STPST tied to a fixed value. The CPU is socketed, however, so one could modify their Intellivision in order to make this useful.
