|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

2013-06-0002

PT0205-9

06/18/13

12

PT7C4337

Real-time Clock Module (I

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.

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

03

Days of the week

0

0

0

0

0

W4

W2

W1

(default)

0

0

0

0

0

Undefined Undefined Undefined

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.

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

04

Dates

0

0

D20

D10

D8

D4

D2

D1

(default)

0

0

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

05

Months

Century

*1

0

0

M10

M8

M4

M2

M1

(default)

Undefined

0

0

Undefined

Undefined

Undefined

Undefined

Undefined

06

Years

Y80

Y40

Y20

Y10

Y8

Y4

Y2

Y1

(default)

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

Undefined

*1: The century bit is toggled when the years register overflows from 99 to 00.

24-hour clock

12-hour clock

24-hour clock

12-hour clock

00

52 ( AM 12 )

12

72 ( PM 12)

01

41 ( AM 01 )

13

61 ( PM 01 )

02

42 ( AM 02 )

14

62 ( PM 02 )

03

43 ( AM 03 )

15

63 ( PM 03 )

04

44 ( AM 04 )

16

64 ( PM 04 )

05

45 ( AM 05 )

17

65 ( PM 05 )

06

46 ( AM 06 )

18

66 ( PM 06 )

07

47 ( AM 07 )

19

67 ( PM 07 )

08

48 ( AM 08 )

20

68 ( PM 08 )

09

49 ( AM 09 )

21

69 ( PM 09 )

10

50 ( AM 10 )

22

70 ( PM 10 )

11

51 ( AM 11 )

23

71 ( PM 11 )