BQ4850Y_14 Datasheet, PDF (3/17 Pages) Texas Instruments – RTC Module With 512Kx8 NVSRAM

Not Recommended For New Designs
bq4850Y
Address Map
The bq4850Y provides 8 bytes of clock and control status
registers and 524,288 bytes of storage RAM.
Figure 2 illustrates the address map for the bq4850Y.
Table 1 is a map of the bq4850Y registers.
8 Bytes
Clock and 7FFFF
Control Status
Registers _7FFF8
7FFF7
32,760
Bytes
Storage
RAM
0
Year 7FFFF
1 Month 7FFFE
2
Date 7FFFD
3
Days 7FFFC
4 Hours 7FFFB
5 Minutes 7FFFA
6 Seconds 7FFF9
7 Control 7FFF8
0000
Figure 2. Address Map
MM-961
Table 1. bq4850Y Clock and Control Register Map
Address D7
D6
D5
D4
D3
D2
D1 D0
7FFFF
10 Years
Year
7FFFE
X
X
X 10 Month
Month
7FFFD
X
X
10 Date
Date
7FFFC
X
FTE
X
X
X
Day
7FFFB
X
X
10 Hours
Hours
7FFFA
X
10 Minutes
Minutes
7FFF9 OSC
10 Seconds
Seconds
7FFF8
W
R
S
Calibration
Notes:
X = Unused bits; can be written and read.
Clock/Calendar data in 24-hour BCD format.
OSC = 1 stops the clock oscillator.
Range (h)
00–99
01–12
01–31
01–07
00–23
00–59
00–59
00–31
Register
Year
Month
Date
Days
Hours
Minutes
Seconds
Control
SLUS057A- January 2005
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