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AT75C Datasheet(PDF) 57 Page - ATMEL Corporation |
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AT75C Datasheet(HTML) 57 Page - ATMEL Corporation |
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57 / 171 page  57 AT75C DSP Subsystem 1368C–INTAP–08/02 CNTX – Context Switching Store or Restore Syntax: cntx s|r Operation: This instruction triggers the context-switching mechanism. s: Store the shadow/swap bits and swap a1 and b1 accumulators’ con- tents. The following bits: st0[0], st0[11..2], st1[11:10], st2[7:0] are pushed to their shadow bits. The page bits st1[7:0] are swapped with their alternative register. r: Restore the shadow/swap bits and swap a1 and b1 accumulators’ contents. The following bits: st0[0], st0[11..2], st1[11:10], st2[7:0] are popped from their shadow bits. The page bits st1[7:0] are swapped with their alternative register. Affected Flags: In store, flags represent the data transferred into a1. In restore, flags are written from their shadow bits. Cycles: 1 Words: 1 Z M NVCE L R xxx – – x – – Z M NVCE L R xxx – – x – – |
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