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©2008 Advanced Micro Devices, Inc.
Real Time Clock (RTC)
AMD SB600 Register Reference Manual Proprietary Page 295
Extended RAM Address Port - RW – 8 bits - [RTC_Reg: 50h]
Field Name Bits Default Description
ExtendedRAMAddr 6:0 00h Because only 7 address bits are used in port x70, only
lower 128 bytes are accessible through port x71. The
Extended RAM (upper 128 bytes) are physically located
at address 80H to FFH. In order to access these
address, an address offset should be programmed into
this register and access them through Extended
RAMDataPort. (An offset of x80H will automatically add
to this 7-bit address).
Reserved 7
Extended RAM Address Port register: The address port to access Extended RAM.
Extended RAM Data Port - RW – 8 bits - [RTC_Reg: 53h]
Field Name Bits Default Description
Extended RAM Data Port 7:0 xxxxxxxx There is no physical register corresponding to this data
port but the data port address is used for decoding to
generate appropriate internal control signals.
Extended RAM Data Port register.
RTC Time Clear - RW – 8 bits - [RTC_Reg: 7Eh]
Field Name Bits Default Description
RtcTimeClear 0 0b Setting this bit will clear the RTC second and RTC time
will stop
Reserved 7:1 0000000b
RTC Time Clear register.
RTC RAM Enable - RW – 8 bits - [RTC_Reg: 7Fh]
Field Name Bits Default Description
RtcRamEnable 0 1b Setting this bit will enable access to the RTC RAM
Reserved 7:1 0000000b
RTC RAM Enable register.