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CS5535 Datasheet(PDF) 421 Page - National Semiconductor (TI) |
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CS5535 Datasheet(HTML) 421 Page - National Semiconductor (TI) |
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421 / 555 page  Revision 0.8 421 www.national.com 5.15 REAL-TIME CLOCK REGISTER DESCRIPTIONS The registers for the Real-Time Clock (RTC) are divided into three sets: • Standard GeodeLink Device MSRs (Shared with DIVIL, see Section 5.6.1 on page 299.) • RTC Specific MSRs • RTC Native Registers The MSRs are accessed via the RDMSR and WRMSR pro- cessor instructions. The MSR address is derived from the perspective of the CPU Core. See Section 3.2 "CS5535 MSR Addressing" on page 53 for more details on MSR addressing. All MSRs are 64 bits, however, the RTC Specific MSRs (summarized in Table 5-55) are called out as 8 bits. The RTC module treats writes to the upper 56 bits (i.e., bits [63:8]) of the 64-bit MSRs as don’t cares and always returns 0 on these bits. The Native registers associated with the RTC module are summarized in Table 5-56 and are accessed as I/O Addresses. The reference column in the summary tables point to the page where the register maps and bit descriptions are listed. Table 5-55. RTC Specific MSRs Summary MSR Address Type Register Name Reset Value Reference 51400054h R/W RTC RAM Lock (RTC_RAM_LOCK) 00h Page 422 51400055h R/W RTC Date of Month Alarm Offset (RTC_DOMA_OFFSET) 00h Page 422 51400056h R/W RTC Month Alarm Offset (RTC_MONA_OFFSET) 00h Page 423 51400057h R/W RTC Century Offset (RTC_CEN_OFFSET) 00h Page 423 Table 5-56. RTC Native Registers Summary I/O Address Type Width (Bits) Register Name Reset Value Reference 00h R/W 8 Seconds (RTC_SEC) 00h Page 424 01h R/W 8 Seconds Alarm (RTC_SECA) 00h Page 424 02h R/W 8 Minutes (RTC_MIN) 00h Page 424 03h R/W 8 Minutes Alarm (RTC_MINA) 00h Page 425 04h R/W 8 Hours (RTC_HR) 00h Page 425 05h R/W 8 Hours Alarm 00h Page 425 06h R/W 8 Day of Week (RTC_DOW) 00h Page 426 07h R/W 8 Day of Month (RTC_DOM) 00h Page 426 08h R/W 8 Month (RTC_MONTH) 00h Page 426 09h R/W 8 Year (RTC_YEAR) 00h Page 427 0Ah R/W 8 RTC Control Register A (RTC_CRA) 20h Page 427 0Bh R/W 8 RTC Control Register B (RTC_CRB) 00h Page 428 0Ch RO 8 RTC Control Register C (RTC_CRC) 00h Page 429 0Dh RO 8 RTC Control Register D (RTC_CRD) 00h Page 429 Programmable (Note 1) Note 1. Register location is programmable (through the MSR registers) and overlay onto the lower RAM space. R/W 8 Date of Month Alarm (RTC_DOMA) 00h Page 430 Programmable (Note 1) R/W 8 Month Alarm (RTC_MONA) 00h Page 430 Programmable (Note 1) R/W 8 Century (RTC_CEN) 00h Page 431 |
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