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M68ICS08GR датащи(PDF) 61 Page - Freescale Semiconductor, Inc |
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M68ICS08GR датащи(HTML) 61 Page - Freescale Semiconductor, Inc |
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61 / 408 page ![]() MC68HC908GR8 — Rev 4.0 Technical Data MOTOROLA Resets and Interrupts 61 Technical Data — MC68HC908GR8 Section 4. Resets and Interrupts 4.1 Contents 4.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 4.3 Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 4.4 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 4.2 Introduction Resets and interrupts are responses to exceptional events during program execution. A reset re-initializes the MCU to its startup condition. An interrupt vectors the program counter to a service routine. 4.3 Resets A reset immediately returns the MCU to a known startup condition and begins program execution from a user-defined memory location. 4.3.1 Effects A reset: • Immediately stops the operation of the instruction being executed • Initializes certain control and status bits • Loads the program counter with a user-defined reset vector address from locations $FFFE and $FFFF • Selects CGMXCLK divided by four as the bus clock Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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