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Download 80296SA Microcontroller User`s Manual
Transcript
80296SA USER’S MANUAL Table A-6. Instruction Set (Continued) Mnemonic EXTB Operation Instruction Format SIGN-EXTEND SHORT-INTEGER INTO INTEGER. Sign-extends the low-order byte of the operand throughout the high-order byte of the operand. EXTB wreg (00010110) (wreg) if DEST.7 = 1 then (high byte DEST) ← 0FFH else (high byte DEST) ← 0 end_if PSW Flag Settings IDLPD Z N C V VT ST ✓ ✓ 0 0 — — IDLE/POWERDOWN/STANDBY. Depending on the 8-bit value of the KEY operand, this instruction causes the device to: • • • • enter idle mode, if KEY=1, enter powerdown mode, if KEY=2, enter standby mode, if KEY=3, execute a reset sequence, if KEY = any value other than 1, 2, or 3. The bus controller completes any prefetch cycle in progress before the CPU stops or resets. if KEY = 1 then enter idle else if KEY = 2 then enter powerdown else if KEY = 3 then enter standby else execute reset PSW Flag Settings Z N C V VT ST KEY = 1, 2, or 3 — — — — — — KEY = any value other than 1, 2, or 3 0 A-20 0 0 0 0 0 IDLPD #key (11110110) (key)
