RS5C372B(1997) View Datasheet(PDF) - RICOH Co.,Ltd.

Part Name

Description

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RS5C372B
(Rev.:1997)

I2C-bus Serial Interface Real Time Clock (8pin SSOP)

RICOH Co.,Ltd. 

RS5C372B

Minute digits: Range from 00 to 59 and carried to hour digits when incremented from 59 to 00.

Hour digits: See descriptions on the 12/24 bit (Section 2.2.1).

Carried to day and day-of-the-week digits when incremented from 11 p.m. to 12 a.m. or 23 to 00.

• Any registered imaginary time should be replaced with correct time as carrying to such

registered imaginary time digits from lower-order ones cause the clock counter malfunction.

2.4. Day of the Week Counter (Internal address at 3h)

D7

D6

D5

D4

D3

D2

D1

D0

-

-

-

-

-

W4

W2

W1 (for write operation)

0

0

0

0

0

W4

W2

W1 (for read operation)

0

0

0

0

0

unde- unde- unde- Default(*)

fined fined fined

*)The default means read values when XSTP=”1” by after initial power-on or supply voltage drop,etc.

• Day-of-the-week digits are incremented by 1 when carried to 1-day digits.

• Day-of-the-week digits display (incremented in septimal notation):

(W4W2W1)=(000)→(001) →⋅⋅⋅⋅⋅→ (110) → (000)

• The relation between days of the week and day-of-the-week digits is user changeable

(e.g. Sunday=0,0,0).

• The (W4, W2, W1) should not be set to (1, 1, 1).

2.5. Calendar Counter (Internal address at 4-6h)

2.5.1. Day Digit Register (Internal address at 4h)

D7

D6

D5

D4

D3

-

-

D20 D10

D8

0

0

D20 D10

D8

0

0

unde- unde- unde-

fined fined fined

D2

D4

D4

unde-

fined

D1

D2

D2

unde-

fined

D0

D1

D1

unde-

fined

(for write operation)

(for read operation)

Default(*)

2.5.2. Month Digit Register (Internal address at 5h)

D7

D6

D5

D4

D3

D2

-

-

-

MO10 MO8 MO4

0

0

0

MO10 MO8 MO4

0

0

0

unde- unde- unde-

fined fined fined

D1

MO2

MO2

unde-

fined

D0

MO1

MO1

unde-

fined

(for write operation)

(for read operation)

Default(*)

2.5.3. Year Digit Register (Internal address at 6h)

D7

D6

D5

D4

D3

D2

D1

D0

Y80 Y40 Y20 Y10

Y8

Y4

Y2

Y1 (for write operation)

Y80 Y40 Y20 Y10

Y8

Y4

Y2

Y1 (for read operation)

unde- unde- unde- unde- unde- unde- unde- unde- Default(*)

fined fined fined fined fined fined fined fined

*)The default means read values when XSTP=“1” by after initial power-on or supply voltage drop,etc.

• The automatic calendar function provides the following calendar digit displays in BCD code.

Day digits: Range from 1 to 31 (for January, March, May, July, August, October, and December).

Range from 1 to 30 (for April, June, September, and November).

Range from 1 to 29 (for February in leap years).

Range from 1 to 28 (for February in ordinary years).

Carried to month digits when cycled to 1.

Month digits: Range from 1 to 12 and carried to year digits when cycled to 1.

Year digits: Range from 00 to 99 and 00, 04, 08,..., 92, and 96 are counted as leap years.

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