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HMNR28DV-85I Datasheet(PDF) 10 Page - Hanbit Electronics Co.,Ltd

Part # HMNR28DV-85I
Description  5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
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Manufacturer  HANBIT [Hanbit Electronics Co.,Ltd]
Direct Link  http://www.hbe.co.kr
Logo HANBIT - Hanbit Electronics Co.,Ltd

HMNR28DV-85I Datasheet(HTML) 10 Page - Hanbit Electronics Co.,Ltd

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HANBit
HMNR28D(V)
URL : www.hbe.co.kr
10
HANBit Electronics Co.,Ltd.
Rev. 0.0 (March, 2002)
Register Map
Data
Address
D7
D6
D5
D4
D3
D2
D1
D0
Funtion /
Range BCD Format
7FF
10Years
Year
Year
00-99
7FE
0
0
0
10M
Month
Month
01-12
7FD
0
0
10 Date
Date : Day of Month
Date
01-31
7FC
0
FT
0
0
0
Day
Day
01-07
7FB
0
0
10 Hours
Hours(24 Hour Format)
Hours
00-23
7FA
0
10 Minutes
Minutes
Minutes
00-59
7F9
ST
10 Seconds
Seconds
Seconds
00-59
7F8
W
R
S
Calibration
Control
7F7
0
0
0
0
0
0
0
0
7F6
0
0
0
0
0
0
0
0
7F5
0
0
0
0
0
0
0
0
7F4
0
0
0
0
0
0
0
0
7F3
0
0
0
0
0
0
0
0
7F2
0
0
0
0
0
0
0
0
7F1
1000 Years
100 Years
Century
00-99
7F0
0
0
0
BL
0
0
0
0
Flag
Keys :
R = READ Bit
W = WRITE Bit
ST = Stop Bit
0 = Must be set to ’0’
BL = Battery Low Flag
S = Sign Bit
CLOCK OPERATIONS
The HMNR28D(V) offers 16 internal registers which contain TIMEKEEPER, and Control data. These registers are memory
locations which contain external (user accessible) and internal copies of the data. The external copies are independent of
internal functions except that they are updated periodically by the simultaneous transfer of the incremented internal copy.
TIMEKEEPER Registers store data in BCD. Control Registers store data in Binary Format.
Reading the Clock
Updates to the TIMEKEEPER registers should be halted before clock data is read to prevent reading data in transition.
The TIMEKEEPER cells in the RAM array are only data registers and not the actual clock counters, so updating the
registers can be halted without disturbing the clock itself. Updating is halted when a ’1’is written to the READ Bit, D6 in the
Control Register (7F8h). As long as a ’1’remains in that position, updating is halted. After a halt is issued, the registers
reflect the count; that is, the day, date, and time that were current at the moment the halt command was is-sued. All of the
TIMEKEEPER registers are updated simultaneously. A halt will not interrupt an update in progress. Updating occurs
approximately 1 second after the READ Bit is reset to a ’0.’


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