S5T8808A

PLL FREQUENCY SHNTHESIZER FOR PAGE

8

Figure 2. Ref. Register Programming Timing

NOTE: It is possible to use Optional selection of EN1, EN2 (when used EN)

•

The Input Reference Frequency (X-tal Oscillator) will divided by 1/4 Prescaler, and then divided by Pre-

programmed R-counter value once more.

•

Programmable R-Counter consists of Fixed 1/4 Prescaler, 14-bits Programmable Counter

When FRC = 0, Fixed 1/4 Prescaler is used and 14-bits counter & can divide Multiple 4

RD = 4, R = 28 (=4 x 7) ~ 65532 -- (Min. Divide value:7)

When FRC = 1, Fixed 1/4 Prescaler isn’t used, but using 14-bits counter & Can divide all value

RD = R = 7 ~ 16384 [All value] --- (Min. Divide value:7)

•

Ex 1) FRC = 0, In case of 14-bits Program, Fosc = 12.8MHz and fixed 1/4 prescaler is used

[(Osc. Freq. / Prescaler) / Ref. Freq.] = [(12.8MHz / 4) / 6.25kHz] = 512

FRC FnFr

* It is possible to use Optional selection of EN1, EN2 ( when used EN )

PMC

DATA

Ref .14Bit R_Counter Data ( RD13 ~ RD0 )

EN1

or

EN2

CLK

positive

edge

triggered

LSB

MSB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

0

0

0

0

1

0

0

0

0

0

0

0

0

0

0

0

1

MSB

LSB

2

13

2

0

R - counter 14 - bits

PMC bit

FnFr

FRC