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M68ICS08GR датащи(PDF) 146 Page - Freescale Semiconductor, Inc |
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M68ICS08GR датащи(HTML) 146 Page - Freescale Semiconductor, Inc |
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146 / 408 page ![]() Central Processing Unit (CPU) Technical Data MC68HC908GR8 — Rev 4.0 146 Central Processing Unit (CPU) MOTOROLA 10.6.1 WAIT mode The WAIT instruction: • clears the interrupt mask (I bit) in the condition code register, enabling interrupts. After exit from WAIT mode by interrupt, the I bit remains clear. After exit by reset, the I bit is set. • Disables the CPU clock 10.6.2 STOP mode The STOP instruction: • clears the interrupt mask (I bit) in the condition code register, enabling external interrupts. After exit from STOP mode by external interrupt, the I bit remains clear. After exit by reset, the I bit is set. • Disables the CPU clock After exiting STOP mode, the CPU clock begins running after the oscillator stabilization delay. 10.7 CPU during break interrupts If the break module is enabled, a break interrupt causes the CPU to execute the software interrupt instruction (SWI) at the completion of the current CPU instruction. See Break Module (BRK). The program counter vectors to $FFFC–$FFFD ($FEFC–$FEFD in monitor mode). A return-from-interrupt instruction (RTI) in the break routine ends the break interrupt and returns the MCU to normal operation if the break interrupt has been deasserted. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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