MC44S803EP FREESCALE [Freescale Semiconductor, Inc], MC44S803EP Datasheet - Page 12

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

The description of each register follows.
CONTROL REGISTER FORMAT
tune and adjust the IC. Which particular control register is
POWER DOWN REGISTER (CR-0)
powered down to save power when not in use. A 1 written to
any of the control bits power down the corresponding circuit.
Conversely, a 0 written to any of the control bits powers up
the corresponding circuit. The reset state for all bits is 1. After
DC power is applied or software reset, the IC is powered up
.
MC44S803
12
MSB
MSB
R19 R18 R17 R16 R15 R14 R13 R12 R11 R10 R9
R19 R18 R17 R16 R15 R14 R13 R12 R11 R10
1
Each Control Register controls a different area of the IC.
There is a set of control registers that are programmed to
The Power Down Register allows various circuits to be
1
1
1
1
1
Table 12. Control Register Address Map
Power Down
Reference Oscillator
Reference Dividers
Mixer & Reference Buffer
Reset/Serial Out
LO 1
LO 2
Circuit Adjust
Test
Digital Tune
LNA AGC
Data Register Address
1
Register Function
1
R19-R0
1
CONTROL REGISTER DEFINITIONS
Figure 8. Power Down Register Format
Control Register Bits
Figure 7. Control Register Format
1
1
R9
R8
1
R8
R7
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
Address Bits
R7
R6
1
A2
written to is a function of the Control Register Address Bits.
These are the 4 LSBs, A3 to A0.
by writing 0s to all desired bits. The interface bus circuits are
never powered down because they are needed in order to
power the IC back up. One should wait at least 20 millisecond
between the time that the IC is powered up through this
command and performing a digital tune of the VCOs. This
time will allow the reference oscillator to stabilize.
0
0
0
0
1
1
1
1
0
0
0
0
R6
R5
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
R4
R5
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
R3
R4
1
Control Reg.
R2
1
R3
CR-x
10
11
0
1
2
3
4
5
6
7
8
9
R1
1
R2
R0
1
R1
A3
0
Freescale Semiconductor
R0
Address Bits
A2
0
A3
A1
Address Bits
0
A2
LSB
A0
0
A1
Reset
State
LSB
A0