SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 108

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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SuperI/O Module
Index F0h
When any non-reserved bit in this register is set to 1, it can be cleared only by hardware reset.
Index F1h
Index F2h
Index F3h
2:0
6:0
6:0
6:0
Bit
7
6
5
4
3
7
7
7
Description
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.
Block RAM Write.
0: No effect on RAM access. (Default)
1: Writes to RAM (Standard and Extended) are ignored.
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.
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.
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.
Reserved.
Reserved.
Date of Month Alarm Register Offset Value.
Reserved.
Month Alarm Register Offset Value.
Reserved.
Century Register Offset Value.
(Continued)
Date Of Month Alarm Register Offset Register - DOMAO (R/W)
Month Alarm Register Offset Register - MANAO (R/W)
Table 4-7.
Century Register Offset Register - CENO (R/W)
RAM Lock Register - RLR (R/W)
RTC Configuration Registers
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Revision 3.0