SBYT: Difference between revisions
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(SBYT instruction) |
m (stored bits->stored in bits) |
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Word address = (T) + (X)/2 | Word address = (T) + (X)/2 | ||
If X is even (bit 0 = 0), the byte is stored bits 8-15 of the word | If X is even (bit 0 = 0), the byte is stored in bits 8-15 of the word | ||
If X is odd (bit 0 = 1), the byte is stored bits 0-7 of the word | If X is odd (bit 0 = 1), the byte is stored in bits 0-7 of the word | ||
== References == | == References == | ||
Latest revision as of 16:51, 24 July 2010
| SBYT | |
|---|---|
| Description | Store byte |
| Format | SBYT |
| Code | 142 6008 |
| Affected | (ea) |
| Type | User |
| Architecture | ND-100, ND-110 |
SBYT is an assembly instruction. The byte in the A register bits 0-7 is stored in one half of the effective address defined by the T and X registers. The other half of the location is unaffected.
As the ND-1x0's RAM is addressed by 16-bit words two registers are needed to address bytes. The T register points to a word, and the X register indicates the byte offset, counting from the left byte of the word pointed to by T.
Word address = (T) + (X)/2 If X is even (bit 0 = 0), the byte is stored in bits 8-15 of the word If X is odd (bit 0 = 1), the byte is stored in bits 0-7 of the word
References
- Norsk Data Document ND–06.014.02 ND-100 REFERENCE MANUAL Page 3-27
- Norsk Data Document ND–06.029.01 ND-110 Instruction Set Page 27, page 91