Figure 2: Reference Frequency Diagram.

Table 2.

MUX SELECT

1

MUX SELECT

2

MUX SELECT

3

MUX SELECT

4

INPUT OF TX PFD

REFTX CONNECTED

TO INTERNAL POINT

(see Note 1)

INPUT OF RX PFD

REFRX CONNECTED

TO INTERNAL POINT

(see Note 2)

0

0

0

0

FREF

FREF

0

0

0

1

FREF

FREF/4

0

0

1

0

FREF

FREF/25

0

0

1

1

FREF

AUXFREF

0

1

0

0

FREF/4

FREF

0

1

0

1

FREF/4

FREF/4

0

1

1

0

FREF/4

FREF/25

0

1

1

1

FREF/4

AUXFREF

1

0

0

0

FREF/25

FREF

1

0

0

1

FREF/25

FREF/4

1

0

1

0

FREF/25

FREF/25

1

0

1

1

FREF/25

AUXFREF

1

1

0

0

AUXFREF

FREF

1

1

0

1

AUXFREF

FREF/4

1

1

1

0

AUXFREF

FREF/25

1

1

1

1

AUXFREF

AUXFREF

Note (1):

point AUX REF.

Note (2):

If the 14 bits auxiliary reference counter is disabled (ARCE control bit = 0) then the internal point AUXFREF is replaced by FREF/ 25.

ST7162

7/17