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ST20-C1 Datasheet(PDF) 3 Page - STMicroelectronics |
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ST20-C1 Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 205 page ![]() 3/205 Contents ® 6 Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 6.1 Exception levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71 6.2 Exception vector table. . . .... . . .. .. ... .. .. ... .. ... .. ... . . . . . . .72 6.3 Exception control block and the saved state. . . .... . .... . . .. .. ... ..73 6.4 Initial exception handler state . .... . . .. .. ... .. ... .. .. ... .. .. ... .74 6.5 Restrictions on exception handlers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75 6.6 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . ... ... .. . . . . ..75 6.7 Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76 6.8 Setting up the exception handler . . . . . . . . . . . . .... . ... ... . . . . . . . .76 7 Multi-tasking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78 7.1 Processes . . . . . . . . . . . . . . . . . . . . .... . . . . . . ... .. ... .. ... . . . . . .78 7.2 Descheduled processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 7.3 Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80 7.4 Timeslicing .... . ... .. ... .. ... . . . . . . . . . . . ... .. ... .. .. . . .... .81 7.5 Inactive processes . . . . . . . . . . .... . . .. .. ... .. ... .. .. ... .. ... . .82 7.6 Descheduled process state. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82 7.7 Initializing multi-tasking . . . . . . . . . . . . . . . . . . . . . .... . . .. .. ... .. ...83 7.8 Scheduling kernels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 7.9 Semaphores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . ..84 7.10 Sleep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85 8 Instruction Set Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87 Appendices . .... . . . . . . . . .... ... .... ... . . .. .... .... .... . 168 A Constants and data structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169 B Instruction set summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174 C Compiling for the ST20-C1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178 D Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187 |
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