NR8576 Series

NIPPON PRECISION CIRCUITS—8

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

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.

3. TM bit: Factory test bit. Should be set to 0 for normal use.

FDT

S40

S20

S10

S8

S1

S2

S4

∗

mi40

mi20

mi10

mi8

mi1

mi2

mi4

h20

h10

h8

h1

h2

h4

∗

∗

w1

w2

w4

∗

d20

d10

d8

d1

d2

d4

∗

∗

∗

mo10

mo8

mo1

mo2

mo4

∗

TM

y80

y40

y20

y10

y8

y1

y2

y4

MSB

LSB

Second ( 0 to 59 )

Minute ( 0 to 59 )

Hour ( 0 to 23 )

Week ( 1 to 7 )

Day ( 1 to 31 )

Month ( 1 to 12 )

Year ( 0 to 99 )

VDD

CE

FDT

(READ MODE)

Detected Pulse

0.5 second

0.5 second