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MC9S08RD60PE Datasheet(PDF) 70 Page - Freescale Semiconductor, Inc |
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MC9S08RD60PE Datasheet(HTML) 70 Page - Freescale Semiconductor, Inc |
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70 / 234 page  Resets, Interrupts, and System Configuration MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11 70 Freescale Semiconductor 5.8.6 System Real-Time Interrupt Status and Control Register (SRTISC) This register contains one read-only status flag, one write-only acknowledge bit, three read/write delay selects, and three unimplemented bits, which always read 0. 76543210 R RTIF 0 RTICLKS RTIE 0 RTIS2 RTIS1 RTIS0 W RTIACK Reset 00000000 = Unimplemented or Reserved Figure 5-8. System RTI Status and Control Register (SRTISC) Table 5-8. SRTISC Field Descriptions Field Description 7 RTIF Real-Time Interrupt Flag — This read-only status bit indicates the periodic wakeup timer has timed out. 0 Periodic wakeup timer not timed out. 1 Periodic wakeup timer timed out. 6 RTIACK Real-Time Interrupt Acknowledge — This write-only bit is used to acknowledge real-time interrupt request (write 1 to clear RTIF). Writing 0 has no meaning or effect. Reads always return 0. 5 RTICLKS Real-Time Interrupt Clock Select — This read/write bit selects the clock source for the real-time interrupt. 0 Real-time interrupt request clock source is internal 1-kHz oscillator. 1 Real-time interrupt request clock source is external clock. 4 RTIE Real-Time Interrupt Enable — This read-write bit enables real-time interrupts. 0 Real-time interrupts disabled. 1 Real-time interrupts enabled. 2:0 RTIS[2:0] Real-Time Interrupt Period Selects — These read/write bits select the wakeup period for the RTI. One clock source for the real-time interrupt is its own internal clock source, which oscillates with a period of approximately tRTI and is independent of other MCU clock sources. Using an external clock source the delays will be crystal frequency divided by value in RTIS2:RTIS1:RTIS0. See Table 5-9. Table 5-9. Real-Time Interrupt Period RTIS2:RTIS1:RTIS0 Internal Clock Source (1) (tRTI = 1 ms, Nominal) 1. See Table A-9 tRTI in Appendix A, “Electrical Characteristics,” for the tolerance on these values. External Clock Source (2) Period = text 2. text is based on the external clock source, resonator, or crystal selected by the ICG configuration. See Table A-9 for details. 0:0:0 Disable periodic wakeup timer Disable periodic wakeup timer 0:0:1 8 ms text x 256 0:1:0 32 ms tex x 1024 0:1:1 64 ms tex x 2048 1:0:0 128 ms tex x 4096 1:0:1 256 ms text x 8192 1:1:0 512 ms text x 16384 1:1:1 1.024 s tex x 32768 |
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