MC44S803EP FREESCALE [Freescale Semiconductor, Inc], MC44S803EP Datasheet - Page 21

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

Freescale Semiconductor
Manual Tune cycle for LO1 and LO2, respectively. The
Manual Tune cycle will count the selected VCO frequency
and put the result in the LO1 or LO2 Result Count register.
The Manual Tune bit will be automatically cleared when the
count is finished. This is really just a way to measure the
current frequency.
Automatic Tune cycle for LO1 and LO2 respectively. Upon
completion of the Auto Tune cycle, this bit will automatically
clear. After the Auto Tune cycle is completed the coarse
tuning is finished.
MSB
MSB
MSB
R19 R18 R17 R16 R15 R14 R13 R12 R11 R10 R9
R19 R18 R17 R16 R15 R14 R13 R12 R11 R10 R9
R19 R18 R17 R16 R15 R14 R13 R12 R11 R10 R9
DC
DC
DC
15
15
15
0
0
0
MT1 and MT2. The Manual Tune request bits will initiate a
AT1 and AT2. The Auto Tune request bits will initiate an
DC
DC
MT2 AT2
14
14
DC
0
0
14
0
DC
DC
13
13
0
0
DC
13
0
DC
DC
12
12
0
0
DC
12
0
Figure 21. Digital Tune Register: LO1 Result Count (Read Only) Register Format
DC
DC
11
11
0
0
DC
11
0
DC
DC
10
10
0
0
DC
10
Figure 20. Digital Tune Register: LO2 Reference Register Format
0
Figure 22. Digital Tune Register: LO2 Result Count (Read Only)
DC
DC
0
9
0
9
DC
0
9
DC
DC
0
8
0
8
DC
LO2 Reference Count
LO1 Result Count
LO2 Result Count
0
8
DC
DC
0
7
0
7
DC
0
7
DC
DC
0
6
0
6
DC
0
6
DC
DC
0
5
0
5
DC
0
5
DC
DC
R8
R8
0
4
0
4
DC
R8
0
4
DC
DC
R7
R7
0
3
0
3
DC
R7
0
3
DC
DC
R6
R6
0
2
0
2
The LO1 and LO2 Reference Count is used to tell the Auto
Tune cycle what frequency to tune to. It is not needed for a
Manual Tune request. Write the respective reference count at
the same time as setting AT1 or AT2. The following equation
is used to determine the reference count.
DC
R6
0
2
Reference Count = (15 * XOd * F) / (2 * XO)
Where: F = desired VCO frequency in MHz
DC
DC
R5
R5
0
1
0
1
DC
R5
0
1
DC
DC
R4
R4
0
0
0
0
DC
R4
XO = crystal frequency in MHz
XOd = XOdivider = 1, 2, 4, or 8 as specified
in the XO Prescaler register.
0
0
RW DA2 DA1 DA0
RW DA2 DA1 DA0
R3
R3
0
0
RW
R3
0
DT Address
DT Address
DT Address
R2
R2
0
1
R2
DA
0
2
R1
R1
1
0
DA
R1
1
1
R0
R0
DA
1
0
R0
0
0
A3
A3
1
1
A3
1
Address Bits
Address Bits
Address Bits
A2
A2
A2
0
0
0
A1
A1
A1
0
0
0
LSB
LSB
LSB
A0
A0
A0
1
1
1
MC44S803
Reset
Reset
Reset
State
State
State
21