PC87317VUL Datasheet, PDF (89/272 Pages) National Semiconductor (TI) – PC87317VUL/PC97317VUL SuperI/O Plug and Play Compatible with ACPI Compliant Controller/Extender

Real-Time Clock (RTC) and Advanced Power Control (APC) (Logical Device 2)
4.9 REGISTER BANK TABLES
TABLE 4-19. Banks 0, 1 and 2 - Common 64-Byte Memory Map
Index
FUNCTION
00h
Seconds
01h
Seconds Alarm
02h
Minutes
03h Minutes Alarm
04h Hours
05h Hours Alarm
06h Day-of-Week
07h Day-of-Month
08h Month
09h Year
0Ah Control Register A
0Bh Control Register B
0Ch Control Register C
0Dh Control Register D
0Eh-3Fh General Purpose RAM
BCD FORMAT
00-59
00-59
00-59
00-59
12hr = 01-12 (AM)
12hr = 81-92 (PM)
24hr = 00-23
12hr = 01-12 (AM)
12hr = 81-92 (PM)
24hr = 00-23
01-07
01-31
01-12
00-99
BINARY FORMAT
00-3b
00-3b
00-3b
00-3b
01-0c (AM)
81-8c (PM)
00-17
01-0c (AM)
81-8c (PM)
00-17
01-07 (Sunday = 1)
01-1f
01-0c
00-63
COMMENTS
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 (bit 7 is read only)
R/W (bit 3 is read only)
All bits read only
All bits read only
R/W
Register
TABLE 4-20. Bank 0 Registers - General Purpose Memory Bank
Index
00h-3Fh
40h - 7Fh
Type Power-on Value
Function
The first 14 RTC registers and the first 50 RTC
RAM bytes are shared among banks 0, 1 and 2.
R/W
General Purpose 64-Byte Battery-Backed RAM.
TABLE 4-21. Bank 1 Registers - RTC Memory Bank
Register
Century
Date 0f Month
Alarm
Month Alarm
Index
Type
00h-3Fh
40h-47h
48h(relocatable) R/W
49h
R/W
4Ah
R/W
4Bh-4Fh
Power-on Value
Function
Banks 0, 1 and 2 share the first 14 RTC registers and the
first 50 RTC RAM bytes.
Reserved. Writes have no effect and reads return 00h
00h
BCD Format: 00-99. Binary Format: 00-63
C0h
BCD Format: 01-31. Binary Format 01-1F. Bits 6,7 are
“don’t care” control
C0h
BCD Format: 01-12. Binary Format 01-0c. Bits 6,7 are
“don’t care” control
Reserved
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