pc87317vul National Semiconductor Corporation, pc87317vul Datasheet - Page 89

• Manufacturer Part Number: pc87317vul
• Description: Pc87317vul/pc97317vul Superi/o Plug And Play Compatible With Acpi Compliant Controller/extender
• Manufacturer: National Semiconductor Corporation

4.9 REGISTER BANK TABLES
Century
Date 0f Month
Alarm
Month Alarm
0Eh-3Fh General Purpose RAM
Index
Register
0Ah
0Bh
0Ch
0Dh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
Register
Minutes Alarm
Hours
Hours Alarm
Day-of-Week
Day-of-Month
Month
Year
Control Register A
Control Register B
Control Register C
Control Register D
Seconds Alarm
48h(relocatable)
FUNCTION
Real-Time Clock (RTC) and Advanced Power Control (APC) (Logical Device 2)
Seconds
Minutes
00h-3Fh
4Bh-4Fh
40h-47h
Index
4Ah
49h
TABLE 4-20. Bank 0 Registers - General Purpose Memory Bank
TABLE 4-19. Banks 0, 1 and 2 - Common 64-Byte Memory Map
40h - 7Fh
00h-3Fh
Index
TABLE 4-21. Bank 1 Registers - RTC Memory Bank
Type
R/W
R/W
R/W
12hr = 01-12 (AM)
12hr = 81-92 (PM)
12hr = 01-12 (AM)
12hr = 81-92 (PM)
Type
R/W
BCD FORMAT
24hr = 00-23
24hr = 00-23
Power-on Value
00-59
00-59
00-59
00-59
01-07
01-31
01-12
00-99
Power-on Value
C0h
C0h
00h
89
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
BCD Format: 00-99. Binary Format: 00-63
BCD Format: 01-31. Binary Format 01-1F. Bits 6,7 are
“don’t care” control
BCD Format: 01-12. Binary Format 01-0c. Bits 6,7 are
“don’t care” control
Reserved
The first 14 RTC registers and the first 50 RTC
RAM bytes are shared among banks 0, 1 and 2.
General Purpose 64-Byte Battery-Backed RAM.
01-07 (Sunday = 1)
BINARY FORMAT
01-0c (AM)
81-8c (PM)
01-0c (AM)
81-8c (PM)
00-3b
00-3b
00-3b
00-3b
00-17
00-17
01-0c
00-63
01-1f
Function
Function
R/W (bit 7 is read only)
R/W (bit 3 is read only)
All bits read only
All bits read only
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
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