NR8576AA Datasheet, PDF (8/10 Pages) Nippon Precision Circuits Inc – Real-time Clock Modules

NR8576 Series
FUNCTIONAL DESCRIPTION
Timer data configuration
s Counter data in BCD code format
s Automatic long/short month and leap-year adjustment
s 24-hour time display
s LSB first write and read data
Second ( 0 to 59 )
MSB
LSB
FDT
S40
S20
S10
S8
S4
S2
S1
Minute ( 0 to 59 )
∗
mi40
mi20
mi10
mi8
mi4
mi2
mi1
Hour ( 0 to 23 )
∗
∗
h20
h10
h8
h4
h2
h1
Week ( 1 to 7 )
∗
w4
w2
w1
Day ( 1 to 31 )
∗
∗
d20
d10
d8
d4
d2
d1
Month ( 1 to 12 )
TM
∗
∗
mo10
mo8
mo4
mo2
mo1
Year ( 0 to 99 )
y80
y40
y20
y10
y8
y4
y2
y1
1. * bit: Optional write bits.
2. FDT bit: Supply voltage detect bit
• The FDT bit is set to 1 when the voltage between VDD and VSS falls below 1.7 ± 0.3 V.
• The FDT bit is reset to 0 for data reads longer than 48 bits. Note that the FDT bit is not reset to 0 for data
reads of 47 bits or less.
• The read/write data bits should be should be set to 0. After the supply voltage is applied, the FDT bit
should be set to 0.
VDD
Detected Pulse
VDET
0.5 second
0.5 second
CE
(READ MODE)
FDT
3. TM bit: Factory test bit. Should be set to 0 for normal use.
NIPPON PRECISION CIRCUITS—8