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MC9S08AW60 Datasheet(PDF) 78 Page - Freescale Semiconductor, Inc |
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MC9S08AW60 Datasheet(HTML) 78 Page - Freescale Semiconductor, Inc |
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78 / 324 page  Chapter 5 Resets, Interrupts, and System Configuration MC9S08AW60 Data Sheet, Rev 2 78 Freescale Semiconductor 5.9.7 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 5-9. System RTI Status and Control Register (SRTISC) Table 5-9. SRTISC Register 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 logic 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 Delay Selects — These read/write bits select the wakeup delay for the RTI. The clock source for the real-time interrupt is a self-clocked source which oscillates at about 1 kHz, is independent of other MCU clock sources. Using external clock source the delays will be crystal frequency divided by value in RTIS2:RTIS1:RTIS0. See Table 5-10. Table 5-10. Real-Time Interrupt Frequency RTIS2:RTIS1:RTIS0 1-kHz Clock Source Delay1 1 Normal values are shown in this column based on f RTI = 1 kHz. See Appendix A, “Electrical Characteristics and Timing Specifications,” fRTI for the tolerance on these values. Using External Clock Source Delay (Crystal Frequency) 0:0:0 Disable periodic wakeup timer Disable periodic wakeup timer 0:0:1 8 ms divide by 256 0:1:0 32 ms divide by 1024 0:1:1 64 ms divide by 2048 1:0:0 128 ms divide by 4096 1:0:1 256 ms divide by 8192 1:1:0 512 ms divide by 16384 1:1:1 1.024 s divide by 32768 |
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