CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 438

• Manufacturer Part Number: CS5535-UDCF
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of CS5535-UDCF

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

6.15
The registers for the Real-Time Clock (RTC) are divided
into three sets:
• Standard GeodeLink Device (GLD) MSRs (Shared with
• 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 4.2 "MSR
Addressing" on page 59 for more details.
Note 1. Register location is programmable (through the MSR registers) and overlay onto the lower RAM space.
438
MSR Address
Programmable
Programmable
Programmable
DIVIL, see Section 6.6.1 on page 317.)
I/O Address
51400054h
51400055h
51400056h
51400057h
(Note 1)
(Note 1)
(Note 1)
0Ah
0Bh
0Ch
0Dh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
Real-Time Clock Register Descriptions
Type
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
31506B
Register Name
RTC RAM Lock (RTC_RAM_LOCK)
RTC Date of Month Alarm Offset
(RTC_DOMA_OFFSET)
RTC Month Alarm Offset (RTC_MONA_OFFSET)
RTC Century Offset (RTC_CEN_OFFSET)
Width
(Bits)
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Table 6-56. RTC Native Registers Summary
Table 6-55. RTC Specific MSRs Summary
Register Name
Seconds (RTC_SEC)
Seconds Alarm (RTC_SECA)
Minutes (RTC_MIN)
Minutes Alarm (RTC_MINA)
Hours (RTC_HR)
Hours Alarm
Day of Week (RTC_DOW)
Day of Month (RTC_DOM)
Month (RTC_MONTH)
Year (RTC_YEAR)
RTC Control Register A (RTC_CRA)
RTC Control Register B (RTC_CRB)
RTC Control Register C (RTC_CRC)
RTC Control Register D (RTC_CRD)
Date of Month Alarm (RTC_DOMA)
Month Alarm (RTC_MONA)
Century (RTC_CEN)
All MSRs are 64 bits, however, the RTC Specific MSRs
(summarized in Table 6-55) 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 6-56 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.
AMD Geode™ CS5535 Companion Device Data Book
Real-Time Clock Register Descriptions
Reset Value
Reset Value
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
20h
00h
00h
00h
00h
00h
00h
Reference
Reference
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