PRELIMINARY SPECIFICATION (V1.5)

FREQUENCY SYNTHESIZER

KB8821/22/23

11

99-06-15

Control Bits

Programmable Reference Counter(IF / RF R Counter)

If the Control Bits are 00(IF) or 01(RF), data is moved from the 20-bit shift register into the R-latch which sets

the reference counter. Serial data format is shown in the table below.

Division Ratio of the R Counter, R

Program Mo

des

♦ 15-Bit Programmable Reference Counter Ratio

Division ratio : 3 to 32767

Data are shifted in MSB first

Control Bits

DATA Location

C1

C2

0

0

IF R Counter

0

1

RF R Counter

1

0

IF N Counter

1

1

RF N Counter

C1

C2

R

1

R

2

R

3

R

4

R

5

R

6

R

7

R

8

R

9

R

10

R

11

R

12

R

13

R

14

R

15

R

16

R

17

R

18

R

19

R

20

Division

Ratio

R

15

R

14

R

13

R

12

R

11

R

10

R

9

R

8

R

7

R

6

R

5

R

4

R

3

R

2

R

1

3

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

4

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

32767

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Control Bits

LSB

MSB