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CDP6805E2Q Datasheet(PDF) 8 Page - InnovASIC, Inc |
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CDP6805E2Q Datasheet(HTML) 8 Page - InnovASIC, Inc |
8 / 33 page IA6805E2 29 August 2007 Microprocessor Unit As of Production Version 00 Registers: The following paragraphs describe the registers contained in the MPU. Figure 6 shows the programming model and Figure 7 shows the interrupt stacking order. A X SP 1 0 0 0 0 0 0 H I N Z C 70 CC CONDITION CODE REGISTER CARRY/BORROW HALF CARRY INTERRUPT MASK NEGATIVE ZERO STACK POINTER PROGRAM COUNTER INDEX REGISTER ACCUMULATOR 70 12 0 7 8 PCH PCL 12 6 0 4 0 Figure 6. Programming Model NOTE: Since the stack pointer decrements during pushes, the PCL is stacked first, followed by PCH, etc. Pulling from the stack is in the reverse order. CONDITION CODE REGISTER ACCUMULATOR INDEX REGISTER 1 1 1 I N T E R R U P T DECREASING MEMORY ADDRESSES STACK PCH 0 0 0 PCL R E T U R N INCREASING MEMORY ADDRESSES UNSTACK Figure 7. Interrupt Stacking Order Copyright © 2007 IA211081401-03 www.Innovasic.com Customer Support: Page 8 of 33 1-888-824-4184 © |
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