Destination register: Difference between revisions
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(Destination Register description (for ROP instructions))) |
(Fixed MAC mnemonics (cut&paste error)) |
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| Line 6: | Line 6: | ||
! [[MAC]] mnemonic !! Register name !! Value !! Octal value to add to ROP instruction | ! [[MAC]] mnemonic !! Register name !! Value !! Octal value to add to ROP instruction | ||
|- | |- | ||
| | | DD || D register || 1 || 1<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DP || Program counter || 2 || 2<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DB || B register || 3 || 3<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DL || L register || 4 || 4<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DA || A register || 5 || 5<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DT || T register || 6 || 6<sub><small>8</small></sub> | ||
|- | |- | ||
| | | DX || X register || 7 || 7<sub><small>8</small></sub> | ||
|} | |} | ||
Latest revision as of 08:29, 14 February 2019
Destination register (abbr. <dr>) is encoded in bits 2..0 of Register Operation (ROP) instructions.
The destination registers are specified as follows:
| MAC mnemonic | Register name | Value | Octal value to add to ROP instruction |
|---|---|---|---|
| DD | D register | 1 | 18 |
| DP | Program counter | 2 | 28 |
| DB | B register | 3 | 38 |
| DL | L register | 4 | 48 |
| DA | A register | 5 | 58 |
| DT | T register | 6 | 68 |
| DX | X register | 7 | 78 |
If no destination register is specified (value: 0) the instruction is normally transformed to a NOP (no-operation). EXIT, EXR, RDIV, MIX3 are exceptions to this and RADD clears the carry indicator (C) only.
References
- Norsk Data Document ND–06.014.02 ND-100 REFERENCE MANUAL Page 3-37
- Norsk Data Document ND–06.029.01 ND-110 Instruction Set Pages 39-40