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MC9S08QD4CPC Datasheet(PDF) 63 Page - Freescale Semiconductor, Inc |
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MC9S08QD4CPC Datasheet(HTML) 63 Page - Freescale Semiconductor, Inc |
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63 / 198 page  Chapter 5 Resets, Interrupts, and General System Control MC9S08QD4 Series MCU Data Sheet, Rev. 6 Freescale Semiconductor 63 5.8.7 System Real-Time Interrupt Status and Control Register (SRTISC) This high-page register contains status and control bits for the RTI. 76 54 321 0 R ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 W Reset: 000 01 001 = Unimplemented or Reserved Figure 5-8. System Device Identification Register — Low (SDIDL) Table 5-9. SDIDL Register Field Descriptions Field Description 7:0 ID[7:0] Part Identification Number — Each derivative in the HCS08 family has a unique identification number. The MC9S08QD4 series is hard coded to the value 0x011. See also ID bits in Table 5-8. 76 54 321 0 RRTIF 0 RTICLKS RTIE 0 RTIS W RTIACK Reset: 000 00 000 = Unimplemented or Reserved Figure 5-9. System RTI Status and Control Register (SRTISC) Table 5-10. 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 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 32 kHz ICS 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 Real-Time Interrupt Delay Selects — These read/write bits select the period for the RTI. See Table 5-11 |
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