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ST7LITE49M Arkusz danych(PDF) 29 Page - STMicroelectronics |
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ST7LITE49M Arkusz danych(HTML) 29 Page - STMicroelectronics |
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29 / 188 page  ST7LITE49M Central processing unit 29/188 6 Central processing unit 6.1 Introduction This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8- bit data manipulation. 6.2 Main features ● 63 basic instructions ● Fast 8-bit by 8-bit multiply ● 17 main addressing modes ● Two 8-bit index registers ● 16-bit stack pointer ● Low power modes ● Maskable hardware interrupts ● Non-maskable software interrupt 6.3 CPU registers The six CPU registers shown in Figure 10. They are not present in the memory mapping and are accessed by specific instructions. Figure 10. CPU registers ACCUMULATOR X INDEX REGISTER Y INDEX REGISTER STACK POINTER CONDITION CODE REGISTER PROGRAM COUNTER 70 1C 11 H I N Z RESET VALUE = RESET VECTOR @ FFFEh-FFFFh 70 70 70 0 7 15 8 PCH PCL 15 8 70 RESET VALUE = STACK HIGHER ADDRESS RESET VALUE = 1X 11X 1X X RESET VALUE = XXh RESET VALUE = XXh RESET VALUE = XXh X = Undefined Value |
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