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MC33596 Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc

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Register Description
MC33596 Data Sheet, Rev. 4
Freescale Semiconductor
39
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
F9
F8
$04
Reset Value
0
1
0
0
1
0
0
0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit Name
F7
F6
F5
F4
F3
F2
F1
F0
$05
Reset Value
0
0
0
0
0
0
0
0
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
11
(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
11
(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
0
1
1
1
1
1
1
1
Access
R/WR/W
R/WR/W
R/WR/W
R/W
R/W
Figure 29. RXONOFF Register


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