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MC-ACT-6809 bảng dữ liệu(PDF) 5 Page - Actel Corporation |
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MC-ACT-6809 bảng dữ liệu(HTML) 5 Page - Actel Corporation |
5 / 7 page Software Compatible 6809 CPU Memec Design February 25, 2003 5 Optimized for Interrupts For interrupting the MC-ACT-6809, there are 3 level-sensitive interrupts: irq_n: standard interrupt or interrupt request, low_active, pushes all registers on stack: PC(Low), PC(High), U(Low), U(High), Y(Low), Y(High), X(Low), X(High), DP, B, A, CC firq_n: fast interrupt, pushes only PC and CC on stack: PC(Low), PC(High), CC nmi_n: non maskable interrupt, pushes all registers on stack: PC(Low), PC(High), U(Low), U(High), Y(Low), Y(High), X(Low), X(High), DP, B, A, CC The nmi_n is masked after reset until the system stack pointer is initialized. The different interrupts will fetch the corresponding vector for the interrupt in the memory: 0xfff0 Illegal Instruction 0xfff2 SWI3 0xfff4 SWI2 0xfff6 FIRQ 0xfff8 IRQ 0xfffa SWI 0xfffc NMI 0xfffe RESET The interrupt behavior of the MC-ACT-6809 matches exactly the one of the original 6809 in terms of results in registers and memory. An exception is the case where an illegal instruction is decoded by the 6809: in this case, the reserved interrupt is used. |
Số phần tương tự - MC-ACT-6809 |
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