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PC912XDP512J1VAA Datasheet(PDF) 72 Page - Freescale Semiconductor, Inc |
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PC912XDP512J1VAA Datasheet(HTML) 72 Page - Freescale Semiconductor, Inc |
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72 / 1350 page  Chapter 1 Device Overview MC9S12XD-Family MC9S12XDP512 Data Sheet, Rev. 2.17 72 Freescale Semiconductor 1.5.2.1 System Stop Modes The system stop modes are entered if the CPU executes the STOP instruction and the XGATE doesn’t execute a thread and the XGFACT bit in the XGMCTL register is cleared. Depending on the state of the PSTP bit in the CLKSEL register the MCU goes into pseudo stop mode or full stop mode. Please refer to CRG section. Asserting RESET, XIRQ, IRQ or any other interrupt ends the system stop modes. 1.5.2.2 Pseudo Stop Mode In this mode the clocks are stopped but the oscillator is still running and the real time interrupt (RTI) or watchdog (COP) submodule can stay active. Other peripherals are turned off. This mode consumes more current than the system stop mode, but the wake up time from this mode is significantly shorter. 1.5.2.3 Full Stop Mode The oscillator is stopped in this mode. All clocks are switched off. All counters and dividers remain frozen. 1.5.2.4 System Wait Mode This mode is entered when the CPU executes the WAI instruction. In this mode the CPU will not execute instructions. The internal CPU clock is switched off. All peripherals and the XGATE can be active in system wait mode. For further power consumption the peripherals can individually turn off their local clocks. Asserting RESET, XIRQ, IRQ or any other interrupt that has not been masked ends system wait mode. 1.5.3 Freeze Mode The enhanced capture timer, pulse width modulator, analog-to-digital converters, the periodic interrupt timer and the XGATE module provide a software programmable option to freeze the module status during the background debug module is active. This is useful when debugging application software. For detailed description of the behavior of the ATD0, ATD1, ECT, PWM, XGATE and PIT when the background debug module is active consult the corresponding sections.. 1.6 Resets and Interrupts Consult the S12XCPU Block Guide for information on exception processing. 1.6.1 Vectors Table 1-12 lists all interrupt sources and vectors in the default order of priority. The interrupt module (S12XINT) provides an interrupt vector base register (IVBR) to relocate the vectors. Associated with each I-bit maskable service request is a configuration register. It selects if the service request is enabled, the service request priority level and whether the service request is handled either by the S12X CPU or by the XGATE module. |
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