8

MK715

Rate Register (Register 2) Programming

P.P.S. = Points Per Second. With 14.7456 MHz clock selected.

Calculating Points Per Second

The formula for determining P.P.S. is:

P.P.S. =

fin

24072+(4096×COUNT)

Where fin is the frequency of the

internal clock (14.3196 MHz or

14.7456 MHz) and COUNT is

the value of the rate register.

On application of power, an internal reset is generated that clears all bits in registers 0, 2, and 3. Register 1 is set to

32 giving a rate of 92 PPS with 14.3196 MHz selected.

Power-On Reset

The interrupt on the MK715 can only be cleared by reading any register or, alternatively, by writing PD (register 0, bit

2) to one, which forces a powerdown. After a fault condition, initialize the MK715 by writing PD to one, then writing

PD to zero. This will always clear pending interrupts.

Initializing the MK715

t

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C.

S

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P

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Pt

n

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C.

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.

P

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Pt

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P

.

P

5

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t

0d

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tt

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e

p

t

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N5

27

1

15

80

4

63

0

36

23

1

10

98

3

70

8

27

29

0

15

96

3

89

5

28

26

0

10

0

14

3

92

4

29

23

0

15

0

12

3

0

17

2

20

30

0

10

1

11

3

1

13

1

21

38

95

1

10

3

2

11

0

22

35

90

2

19

2

3

11

9

13

33

95

2

18

2

4

11

8

14

30

95

3

16

2

5

12

7

15

38

85

4

14

2

6

15

6

10

48

75

5

12

2

7

17

5

15

41

75

6

11

2

8

11

5

10

54

65

7

10

2

9

15

4

15

59

55

8

19

1

0

29

3

10

65

55

9

18

1

1

24

3

15

61

55

0

27

1

2

29

2

10

77

45

1

26

1

3

25

2

15

75

45

3

25

1

4

20

2

10

82

45

5

24

1