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ST20C4 Datasheet(PDF) 113 Page - STMicroelectronics |
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ST20C4 Datasheet(HTML) 113 Page - STMicroelectronics |
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113 / 212 page  ldshadow 113/212 ® ldshadow load shadow registers Code: 60 FC Description: Selectively load (depending on Areg) the shadow registers of the priority determined by Breg from the block of store addressed by Creg. This instruction should only be used with Breg not equal to the current priority. Definition: if (Breg ≠ Priority) { if (Areg0 = 1) { GlobalInterruptEnables ′← word[Creg] 16..23 TrapEnables ′[Breg] ← word[Creg] 0..13 } if (Areg1 = 1) { Status ′[Breg] ← word[Creg @ 1] Wptr ′[Breg] ← word[Creg @ 2] Iptr ′[Breg ← word[Creg @ 3] } if (Areg2 = 1) { Areg ′[Breg] ← word[Creg @ 4] Breg ′[Breg] ← word[Creg @ 5] Creg ′[Breg] ← word[Creg @ 6] } if (Areg3 = 1) { Load block move registers for priority Breg from word ′[Creg @ 7] .. word′[Creg @ 11] } } else Undefined effect Areg ′← undefined Breg ′← undefined Creg ′← undefined Error signals: none |
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