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PT0222(02/06)

Ver: 0

7

Data Sheet

PT7C4300

Real-time Clock Module (I

3.

Time Counter

Time digit display (in BCD code):

•

Second digits: Range from 00 to 59 and carried to minute digits when incremented from 59 to 00.

•

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

•

Hour digits: See description on the /12, 24 bit. Carried to day and day-of-the-week digits when incremented from 11 p.m. to

12 a.m. or 23 to 00.

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

Seconds

ST

S40

S20

S10

S8

S4

S2

S1

00

(default)

0

Undefined Undefined Undefined Undefined Undefined Undefined Undefined

Minutes

M40

M20

M10

M8

M4

M2

M1

01

(default)

0

Undefined Undefined Undefined Undefined Undefined Undefined Undefined

Hours

CEB

*3

CB

*3

H20

H10

H8

H4

H2

H1

02

(default)

0

0

Undefined Undefined Undefined Undefined Undefined Undefined

* Note 1: ST bit: Stop oscillation and time count chain.

* Note 2: Do not care.

* Note 3: Century Enable Bit and Century Bit.

4.

Days of the week Counter

The day counter is a divide-by-7 counter that counts from 00 to 06 and up 06 before starting again from 00. Values that

correspond to the day of week are user defined but must be sequential (i.e., if 0 equals Sunday, then 1 equals Monday, and so on).

Illogical time and date entries result in undefined operation.

The day counter is a divide-by-7 counter that counts from 01 to 07 and up 07 before starting again from 01. Values that

correspond to the day of week are user defined but must be sequential (i.e., if 1 equals Sunday, then 2 equals Monday, and so on).

Illogical time and date entries result in undefined operation.

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

Days of the week

×

×

×

×

×

W4

W2

W1

03

(default)

Undefined

Undefined

Undefined

Undefined

Undefined Undefined Undefined Undefined

5.

Calendar Counter

The data format is BCD format.

•

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.