MC33596 datasheet(39/70 Pages) FREESCALE

39 / 70 page

MC33596 Data Sheet, Rev. 4

Freescale Semiconductor

How this register is used is determined by the FRM bit, which is described below.

FRM = 0 (User Friendly Access)

Bits F[11:0] define the carrier frequency Fcarrier. The local oscillator frequency FLO is then set

automatically to Fcarrier + FIF (with FIF = intermediate frequency).

FRM = 1 (Direct Access)

F[11:0] defines the receiver local oscillator frequency FLO

Table 14 defines the value to be binary coded in the frequency registers F[11;0], versus the desired

frequency value F (in Hz).

Conversely, Table 15 gives the desired frequency F and the frequency resolution versus the value of the

frequency registers F[11;0].

16.4 Receiver On/Off Duration Register

Figure 29 describes the receiver on/off duration register, RXONOFF.

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Addr

Bit Name

————

F11

F10

$04

Reset Value

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit Name

$05

Reset Value

Figure 28. F Register

Table 14. Frequency Register Value versus Frequency Value F

CF[1:0]

Frequency Register Value

00, 01

(2 x F/Fref-35) x 2048

(F/Fref-35) x 2048

Table 15. Frequency Value F versus Frequency Register Value

CF[1:0]

Frequency (Hz)

Frequency Resolution (Hz)

00, 01

(35 + F[11;0]/2048)xFref/2

Fref/4096

(35 + F[11;0]/2048)xFref

Fref/2048

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Addr

Bit Name

BANKA

RON3

RON2

RON1

RON0

ROFF2

ROFF1

ROFF0

$09

Reset Value

Access

R/WR/W

R/W

Figure 29. RXONOFF Register

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