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BQ4850YMA-85 Datasheet(PDF) 3 Page - Texas Instruments

Part # BQ4850YMA-85
Description  RTC Module With 512Kx8 NVSRAM
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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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.
3
Address
D7
D6
D5
D4
D3
D2
D1
D0
Range (h)
Register
7FFFF
10 Years
Year
00–99
Year
7FFFE
X
X
X
10 Month
Month
01–12
Month
7FFFD
X
X
10 Date
Date
01–31
Date
7FFFC
X
FTE
X
X
X
Day
01–07
Days
7FFFB
X
X
10 Hours
Hours
00–23
Hours
7FFFA
X
10 Minutes
Minutes
00–59
Minutes
7FFF9
OSC
10 Seconds
Seconds
00–59
Seconds
7FFF8
W
R
S
Calibration
00–31
Control
Notes:
X = Unused bits; can be written and read.
Clock/Calendar data in 24-hour BCD format.
OSC = 1 stops the clock oscillator.
Table 1. bq4850Y Clock and Control Register Map
Registers
Control Status
Clock and
8 Bytes
RAM
Storage
Bytes
32,760
7FFFF
7FFF7
7FFF8
0000
7
6
5
4
3
2
1
0
7FFF8
7FFF9
7FFFA
7FFFC
7FFFD
7FFFE
7FFFF
Control
Seconds
Minutes
Hours
Days
Date
Month
Year
MM-961
7FFFB
Figure 2. Address Map
Aug. 1996
bq4850Y


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