FDC37N958FR Datasheet, PDF (218/316 Pages) List of Unclassifed Manufacturers – Notebook I/O Controller with Enhanced Keyboard and System Control

Internal Registers
Table 66 shows the address map of the RTC,
ten bytes of time, calendar, and alarm data,
four control and status bytes, 241 bytes of
CMOS registers and one RTC control register.
ADDRESS
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E-7F
(B2) 0-7E
(B2) FF
Table 66 - Address Map
REGISTER TYPE
REGISTER FUNCTION
R/W
Register 0: Seconds
R/W
Register 1: Seconds Alarm
R/W
Register 2: Minutes
R/W
Register 3: Minutes Alarm
R/W
Register 4: Hours
R/W
Register 5: Hours Alarm
R/W
Register 6: Day of Week
R/W
Register 7: Date of Month
R/W
Register 8: Month
R/W
Register 9: Year
R/W
Register A:
R/W
Register B: (Bit 0 is Read
Only)
R
Register C:
R
Register D:
R/W
General purpose
R/W
Bank 2: General purpose
R/W
Bank 2: Shared RTC Control
All 14 bytes are directly writable and readable by the host with the following exceptions:
A. Registers C and D are read only
B. Bit 7 of Register A is read only
C. Bits 0 of Register B is read only
D. Bits 7-1 of the Shared RTC Control register are read only
SMSC DS – FDC37N958FR
Page 212
Rev. 09/01/99