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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7220 датащи(PDF) 183 Page - Renesas Technology Corp |
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7220 датащи(HTML) 183 Page - Renesas Technology Corp |
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183 / 303 page  APPLICATION 5.1 Example of multi-line display 7220 Group User’s Manual 5-10 (2) When setting multiple interrupts Various priority processings are executed by enabling multiple interrupts and by setting priorities by software. For example, to set the priority listed below; Timer 1 interrupt VSYNC interrupt CRT interrupt execute the following process: Set only interrupt enable bits (ICON1, ICON2) whose priorities are higher than the current interrupt, and enable the interrupt disable flag (I) in only the current interrupt processing routine. Figure 5.1.9 shows the timing when all interrupt request bits (CRT, VSYNC, Timer 1) are “1” at the same sampling point. Note: When setting multiple interrupts, be sure to determine priority levels to prevent occurrence of plural interrupts with the same priority level. Fig. 5.1.9 Timing when all interrupt request bits are “1” at the same sampling point CRT interrupt request bit VSYNC interrupt request bit Timer 1 interrupt request bit CRT interrupt processing VSYNC interrupt processing Timer 1 interrupt processing Interrupt disable flag (I) 1 0 1 0 1 0 A B 1’ 1 A’ (series of ) 3 B’ 3 (series of ) 3 (series of ) 2 2 |
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