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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M306V2EEFS датащи(PDF) 57 Page - Renesas Technology Corp |
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M306V2EEFS датащи(HTML) 57 Page - Renesas Technology Corp |
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57 / 271 page  Rev.1.40 Oct 06, 2004 page 57 of 269 M306V2ME-XXXFP, M306V2EEFP 2.7.10 Interrupt Sequence An interrupt sequence — what are performed over a period from the instant an interrupt is accepted to the instant the interrupt routine is executed — is described here. If an interrupt occurs during execution of an instruction, the processor determines its priority when the execution of the instruction is completed, and transfers control to the interrupt sequence from the next cycle. If an interrupt occurs during execution of either the SMOVB, SMOVF, SSTR or RMPA instruction, the processor temporarily suspends the instruction being executed, and transfers control to the interrupt sequence. In the interrupt sequence, the processor carries out the following in sequence given: (1) CPU gets the interrupt information (the interrupt number and interrupt request level) by reading ad- dress 0000016. (2) Saves the content of the flag register (FLG) as it was immediately before the start of interrupt se- quence in the temporary register (Note) within the CPU. (3) Sets the interrupt enable flag (I flag), the debug flag (D flag), and the stack pointer select flag (U flag) to “0” (the U flag, however does not change if the INT instruction, in software interrupt numbers 32 through 63, is executed) (4) Saves the content of the temporary register (Note 1) within the CPU in the stack area. (5) Saves the content of the program counter (PC) in the stack area. (6) Sets the interrupt priority level of the accepted instruction in the IPL. After the interrupt sequence is completed, the processor resumes executing instructions from the first address of the interrupt routine. Note: This register cannot be utilized by the user. 2.7.11 Interrupt Response Time 'Interrupt response time' is the period between the instant an interrupt occurs and the instant the first instruction within the interrupt routine has been executed. This time comprises the period from the occurrence of an interrupt to the completion of the instruction under execution at that moment (a) and the time required for executing the interrupt sequence (b). Figure 2.7.4 shows the interrupt response time. Instruction Interrupt sequence Instruction in interrupt routine Time Interrupt response time (a) (b) Interrupt request acknowledged Interrupt request generated Figure 2.7.4 Interrupt response time |
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