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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD17062 датащи(PDF) 112 Page - Renesas Technology Corp |
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UPD17062 датащи(HTML) 112 Page - Renesas Technology Corp |
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112 / 298 page  110 µPD17062 11.2.6 Interrupt Enable Flip-Flop (INTE) The interrupt enable flip-flop sets the interrupt permissions of all four types of interrupts. If each interrupt request processing block outputs a 1 while this flip-flop is set to 1, a 1 is output from this flip-flop and an interrupt is accepted. Even if a 1 is output from each interrupt request processing block while this flip-flop is reset to 0, an interrupt is not accepted. To set or reset this flip-flop, use exclusive instructions EI (set) and DI (reset). If the EI instruction is executed, this flip-flop is set when the instruction executed after the EI instruction is completed. If the DI instruction is executed, the flip-flop is reset during the DI instruction execution cycle. If an interrupt is accepted while the interrupt enable flip-flop is set (EI state), this flip-flop is reset (DI state). Even if the DI instruction is executed in the DI state or the EI instruction is executed in the EI state, the instruction is invalid. This flag is reset (DI state) at power-on reset, clock stop, or CE reset. 11.2.7 Stack Pointer, Address Stack Register, and Program Counter The return address of control returned from the interrupt processing routine is saved in the address stack register. The stack pointer specifies one of six address stack registers (ASR0 to ASR5) to be used. In other words, when an interrupt is accepted, the stack pointer value is reduced by 1, and the program counter value is saved in the address stack register indicated by the stack pointer. Next, if exclusive return instruction RETI is executed after the interrupt processing routine, the contents of the address stack register indicated by the stack pointer are returned to the program counter. At this time, the stack pointer value is increased by 1. See also Chapter 4. 11.2.8 Interrupt Stack The interrupt stack saves the contents of the bank register and index enable flag in the system register when an interrupt is accepted. When the interrupt is accepted and the contents of the bank register and index enable flag are saved, the bank register and index enable flag in the system register are reset to 0. The interrupt stack can save the contents of the bank registers and index enable flags of up to two levels. Therefore, the interrupt stack can issue multiple interrupts of up to two levels; for example, an interrupt can be accepted during execution of a routine that is processing another interrupt. The contents of the interrupt stack are restored in the bank register and index enable flag in the system register by executing the RETI instruction. The RETI instruction is exclusively used to return control from the interrupt processing routine. See also Chapter 4. |
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