NJU6350

s FUNCTIONAL DESCRIPTION

1. Timer and System control data format

The NJU6350 adopts BCD code consisting of 4 bits per digit.

The calendar function including the last date of each month and the leap year calculation is executed

automatically. The system control data operates Data I/O mode set, Oscillator output set and Test mode set.

The unused bit for the Timer and System control data is always set to “ 0 ”.

< System control data format >

MSB

LSB

System control data block

C2

C1

C0

RW

C2

C1

C0

RW

C

o

n

t

e

n

t

s

Writing the data of oscillator output / test mode set

F = " 0 " : Oscilator output off (high impedance status)

F = " 1 " : Oscilator output on

T0 to 6:Test mode set ( Normaly all " 0 " )

MSB

LSB

F

T6

T5T4

T3

T2T1

T0

000

1

0

0

1

1

Writing the data of " Year "

0

1

0

1

Writing the data of " Month "

0

1

1

1

Writing the data of " Date "

1

0

0

1

Writing the data of " Days of Week "

1

0

1

1

Writing the data of " Hour "

1

1

0

1

Writing the data of " Minute "

1

1

1

1

Writing the data of " Second "

0

0

1

0

Reading the data of " Year "

0

1

0

0

Reading the data of " Month "

0

1

1

0

Reading the data of " Date "

1

0

0

0

Reading the data of " Days of Week "

1

0

1

0

Reading the data of " our "

1

1

0

0

Reading the data of " Minute "

1

1

1

0

Reading the data of " Second "

000

0

nvalidity

< Timer data format >

MSB

LSB

Range

Second

0

S6

S5S4

S3S2

S1S0

0

∼ 59

Minute

0

m6

m5m4

m3m2

m1m0

0

∼ 59

Hour

0

0

H5

H4

H3

H2

H1

H0

0

∼ 23

Days of Week

DC

W2

W1

W0

1

∼ 7

Date

0

0

D5

D4

D3

D2

D1

D0

1

∼ 31

Month

0

0

0

M4

M3

M2

M1

M0

1

∼ 12

Year

Y7

Y6

Y5

Y4

Y3

Y2

Y1

Y0

0

∼ 99

Note1) The bit of " DC " in the " Days of Week " is a flag as the result of Low Voltage Detection. If the supply

voltage is reduced to the detection voltage level, then the flag of " DC " is set to "1" at the read operation,

and else the flag is always " 0 ".

(Note2) Only the data of Sec.., ..,Year as data of Timer and Calendar must be written to the NJU6350 why any

other data will be causes in malfunction of the timer counter.