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MC68HC908AP16CFB Datasheet(PDF) 140 Page - Motorola, Inc |
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MC68HC908AP16CFB Datasheet(HTML) 140 Page - Motorola, Inc |
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140 / 440 page  System Integration Module (SIM) Data Sheet MC68HC908AP Family — Rev. 2.5 140 MOTOROLA Interrupts are latched, and arbitration is performed in the SIM at the start of interrupt processing. The arbitration result is a constant that the CPU uses to determine which vector to fetch. Once an interrupt is latched by the SIM, no other interrupt can take precedence, regardless of priority, until the latched interrupt is serviced (or the I bit is cleared). (See Figure 9-10.) Figure 9-10. Interrupt Processing NO NO NO YES NO NO YES YES AS MANY INTERRUPTS I BIT SET? FROM RESET BREAK I-BIT SET? IRQ1 INTERRUPT? SWI INSTRUCTION? RTI INSTRUCTION? FETCH NEXT INSTRUCTION UNSTACK CPU REGISTERS STACK CPU REGISTERS SET I-BIT LOAD PC WITH INTERRUPT VECTOR EXECUTE INSTRUCTION YES YES AS EXIST ON CHIP INTERRUPT? Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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