CDP68HC68T1

FN1547 Rev 9.00

Page 6 of 24

Decemember 8, 2015

SECONDS

MINUTES

HOURS

DAY OF WEEK

DATE

MONTH

YEARS

NOT USED

SEC ALARM

MIN ALARM

HRS ALARM

NOT USED

NOT USED

NOT USED

NOT USED

NOT USED

STATUS REGISTER

CONTROL REGISTER

INTERRUPT CONTROL REGISTER

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

$20

$21

$22

$23

$24

$25

$26

$27

$28

$29

$2A

$2B

$2C

$2D

$2E

$2F

$30

$31

$32

CLOCK/CALENDAR

13 BYTES UNUSED

TEST MODE

32 RAM LOCATIONS

$00

$1F

$20

$32

$33

$3F

$55

85

63

51

50

32

31

0

R = READABLE

W = WRITABLE

R, W

R, W

R, W

R, W

R, W

R, W

R, W

W

W

W

R

R, W

R, W

FIGURE 2. ADDRESS MAP

TABLE 1. CLOCK/CALENDAR AND ALARM DATA MODES

ADDRESS LOCATION (H)

FUNCTION

DECIMAL RANGE

BCD DATA RANGE

BCD DATE EXAMPLE

(Note 6)

20

Seconds

0 to 59

00 to 59

18

21

Minutes

0 to 59

00 to 59

49

22

Hours

12 Hour Mode

(Note 7)

1 to 12

81 to 92 (AM)

A1 to B2 (PM)

A3

Hours

24 Hour Mode

0 to 23

00 to 23

15

23

Day of the Week

(Sunday = 1)

1 to 7

01 to 07

03

24

Day of the Month

(Date)

1 to 31

01 to 31

29

25

Month

Jan = 1, Dec = 12

1 to 12

01 to 12

10

26

Years

0 to 99

00 to 99

85

28

Alarm Seconds

0 to 59

00 to 59

18

29

Alarm Minutes

0 to 59

00 to 59

49

2A

Alarm Hours (Note 8)

12 Hour Mode

1 to 12

01 to 12 (AM)

21 to 32 (PM)

23

Alarm Hours

24 Hour Mode

0 to 23

00 to 23

15

NOTES:

6. Example: 3:49:18, Tuesday. Oct. 29,1985.

7. Most significant Bit, D7, is “0” for 24 hours, and “1” for 12 hour mode. Data Bit D5 is “1” for PM and ‘0” for AM in 12 hour mode.

8. Alarm hours. Data Bit D5 is “1” for PM and “0” for AM in 12 hour mode. Data Bits D7 and D6 are DON’T CARE.