MC44S803EP FREESCALE [Freescale Semiconductor, Inc], MC44S803EP Datasheet - Page 13

• Manufacturer Part Number: MC44S803EP
• Description: Low Power CMOS Broadband Tuner
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale Semiconductor
REFERENCE OSCILLATOR REGISTER (CR-1)
the operation of the reference oscillator. There is only one bit
that needs to be changed. That bit is Osc Sel. This should be
set according to the table below.
kept at their reset values with the exception of the start
up sequence.
CR1 = 10 11xx xxxx 0001
Register
CR0 = Power down register (typically program
all circuits to power up with:
Wait 10mS before issuing next CR1 command
CR1 = 10 01xx xxxx 0001
mand)
Wait 20mS between the second CR1 command and
a CR9 command. (Other registers can be writ-
ten during this 20mS wait period.)
0000 0000 0010 0000 0000 0000)
The Reference Oscillator register contains bits that affect
The start up programming sequence is as follows:
All other bits should be
Table 13. Power Down Bit Table
Crystal Oscillator
Bit
10
11
12
13
14
15
16
17
18
19
0
1
2
3
4
5
6
7
8
9
(second CR1 com-
VCO 1
Buf1
CP1
Synth1
VCO 2
Reserved
CP2
Synth2
Mix1
Reserved
LNA
IF1
IF2
Reserved
Reserved
AGC Amp
Ref Osc
Buf2
RF Pwr Det
IF Pwr Det
Mnemonic
Voltage Controlled Oscillator 1
VCO 1 Buffer
Charge Pump 1
Synthesizer 1
Voltage Controlled Oscillator 2
Reserved
Charge Pump 2
Synthesizer 2
First Mixer
Reserved
Low Noise Amplifier
First IF
Second IF
Reserved
Reserved
AGC Amplifier
Reference Oscillator
VCO 2 Buffer
RF Power Detector
IF Power Detector
CR9 (prescaler)
CR9 command for LO1 auto tune
CR9 command for LO2 auto tune
Note: The crystal oscillator needs to be operating before the
CR9 registers are written.
Function
MC44S803
13