AMD Geode SC1201 - Manual (Page 99)

AMD Geode™ SC1200/SC1201 Processor Data Book 99
SuperI/O Module 32579B
Table 5-7. RTC Configuration Registers
Bit Description
Index F0h RAM Lock Register - RLR (R/W)
When any non-reserved bit in this register is set to 1, it can be cleared only by hardware reset.
7 Block Standard RAM.
0: No effect on Standard RAM access. (Default)
1: Read and write to locations 38h-3Fh of the Standard RAM are blocked, writes ignored, and reads return FFh.
6 Block RAM Write.
0: No effect on RAM access. (Default)
1: Writes to RAM (Standard and Extended) are ignored.
5 Block Extended RAM Write. This bit controls writes to bytes 00h-1Fh of the Extended RAM.
0: No effect on the Extended RAM access. (Default)
1: Writes to bytes 00h-1Fh of the Extended RAM are ignored.
4 Block Extended RAM Read. This bit controls read from bytes 00h-1Fh of the Extended RAM.
0: No effect on Extended RAM access. (Default)
1: Reads to bytes 00h-1Fh of the Extended RAM are ignored.
3 Block Extended RAM. This bit controls access to the Extended RAM 128 bytes.
0: No effect on Extended RAM access. (Default)
1: Read and write to the Extended RAM are blocked: writes are ignored and reads return FFh.
2:0 Reserved.
Index F1h Date Of Month Alarm Register Offset Register - DOMAO (R/W)
7 Reserved.
6:0 Date of Month Alarm Register Offset Value.
Index F2h Month Alarm Register Offset Register - MANAO (R/W)
7 Reserved.
6:0 Month Alarm Register Offset Value.
Index F3h Century Register Offset Register - CENO (R/W)
7 Reserved.
6:0 Century Register Offset Value.