mc13109 Freescale Semiconductor, Inc, mc13109 Datasheet - Page 18

• Manufacturer Part Number: mc13109
• Description: Universal Cordless Telephone Subsystem
• Manufacturer: Freescale Semiconductor, Inc

Reference Frequency Selection
when connected to an external parallel–resonant crystal. The
reference oscillator is also the second local oscillator for the
RF Receiver. Figure 16 shows the relationship between
different crystal frequencies and reference frequencies for
cordless phone applications in various countries.
18
The “LO 2 In” and “LO 2 Out” pins form a reference oscillator
Frequency
10.24 MHz
10.24 MHz
11.15 MHz
12.00 MHz
11.15 MHz
11.15 MHz
11.15 MHz
Crystal
Disable
Figure 16. Reference Frequency and
ALC
MSB
MSB
U.K. Handset
Reference Divider Values
Reference
Select
Used
Divider
Not
Value
2048
1024
2230
2400
1784
446
446
Disable
Limiter
U.K. Base
U.K. Base/
Figure 15. Microprocessor Interface Data Latch Registers
Select
Handset
Divider
Disable
25
1
4
1
1
1
4
Clk
Clk Out
MSB
Select
2–Bit
Frequency
Reference
6.25 kHz
6.25 kHz
5.0 kHz
2.5 kHz
5.0 kHz
5.0 kHz
1.0 kHz
4–Bit Test
Mode
5–Bit CD Threshold Control
Reference Counter Latch
15–Bit Mode Control Latch
Threshold Control Latch
T x Counter Latch
14–Bit R x Counter
14–Bit T x Counter
R x Counter Latch
7–Bit Auxillary Latch
MC13109
Volume
Control
4–Bit
Capacitor Selection
12–Bit Reference Counter
3–Bit 1st LO
Reference Counter
and T x loops are generated. All countries except U.K. require
that the T x and R x reference frequencies be identical. In this
case, set “U.K. Base Select” and “U.K. Handset Select” bits
to “0”. Then the fixed divider is set to “1” and the T x and R x
reference frequencies will be equal to the crystal oscillator
frequency divided by the programmable reference counter
value. The U.K. is a special case which requires a different
reference frequency value fo T x and R x .
U.K. handset operation, set “U.K. Handset Select” to “1”. The
Netherlands is also a special case since a 2.5 kHz reference
frequency is used for both the T x and R x reference and the
total divider value required is 4096 which is larger than the
maximum divide value available from the 12–bit reference
divider (4095). In this case, set “U.K. Base Select” to “1” and
set “U.K. Handset Select” to “1”. This will give a fixed divide
by 4 for both the T x and R x reference. Then set the reference
divider to 1024 to get a total divider of 4096.
Mode Control Register
and microprocessor clock output frequency are all set by the
Control Register. Operation of the Control Register is
explained in Figures 18 through 25.
Figure 17 shows how the reference frequencies for the R x
For U.K. base operation, set “U.K. Base Select” to “1”. For
Power saving modes, mutes, disables, volume control,
Stdby
Mode
Mode
R x
MOTOROLA ANALOG IC DEVICE DATA
Mute
T x
Mute
R x
LSB
LSB
LSB
Mute
SP
1. (00000001)
2. (00000010)
3. (00000011)
4. (00000100)
5. (00000101)
6. (00000110)
7. (00000111)
Latch Address