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HT9580 Scheda tecnica(PDF) 44 Page - Holtek Semiconductor Inc |
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HT9580 Scheda tecnica(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 63 page  HT9580 44 April 28, 2000 Preliminary 8 bits. The counter is incremented each time an instruction or data is fetched from the program memory. Stack pointer The stack pointer is an 8-bit register which is used to control the addressing of the vari- able-length stack. The stack pointer is auto- matically incremented and decremented under control of the microprocessor to perform stack manipulations under direction of either the program or interrupt (NMI and IRQ). The stack allows simple implementation of nested sub- routines and multiple level interrupts. The stack pointer is initialized by the user¢s soft- ware. Status register N VEB D I Z C Note: C: Carry 1=true Z: Zero 1=true I: IRQ 1=disable D: Decimal mode 1=true B: BRK command 1=BRK, 0=IRQ E: Expansion bit (reserved) V: Overflow 1=true N: Negative 1=negative 70 A A ccu m u l a t o r A 70 Y I nde x R egi s t er Y 70 X I nde x R egi s t er X 70 P C L P r ogr am C ount er P C 70 S S ta c k P o i n te r 158 PC H T he w i dt h of t he c o r r e s p ondi ng r e gi s t er s 15 0 0 0 0 0 0 0 1 |
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