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PT0225(11/05)

Ver: 0

7

Data Sheet

PT7C4302

Real-time Clock Module (3-wire Interface)

a)

12 / 24 bit

This bit is used to select between 12-hour clock operation and 24-hour clock operation.

12, /24

Description

Hours register

0

24-hour time display

1

12-hour time display

Be sure to select between 12-hour and 24-hour clock operation before writing the time data.

4.

Days of the week Counter

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

0

0

0

0

0

W4

W2

W1

05

(default)

0

0

0

0

0

Undefined Undefined Undefined

24-hour clock

12-hour clock

24-hour clock

12-hour clock

00

92 ( AM 12)

12

B2 ( PM 12 )

01

81 ( AM 01 )

13

A1 ( PM 01 )

02

82 ( AM 02 )

14

A2 ( PM 02 )

03

83 ( AM 03 )

15

A3 ( PM 03 )

04

84 ( AM 04 )

16

A4 ( PM 04 )

05

85 ( AM 05 )

17

A5 ( PM 05 )

06

86 ( AM 06 )

18

A6 ( PM 06 )

07

87 ( AM 07 )

19

A7 ( PM 07 )

08

88 ( AM 08 )

20

A8 ( PM 08 )

09

89 ( AM 09 )

21

A9 ( PM 09 )

10

90 ( AM 10 )

22

B0 ( PM 10 )

11

91 ( AM 11 )

23

B1 ( PM 11 )