參數(shù)資料
型號(hào)： MC13109
廠商： Motorola, Inc.
英文描述： Universal Cordless Telephone Subsystem IC
中文描述： 通用無繩電話子系統(tǒng)集成電路
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 395K
代理商： MC13109
MC13109
18
MOTOROLA ANALOG IC DEVICE DATA
Figure 15. Microprocessor Interface Data Latch Registers
14–Bit Tx Counter
MSB
LSB
1. (00000001)
2. (00000010)
3. (00000011)
4. (00000100)
5. (00000101)
6. (00000110)
7. (00000111)
Latch Address
14–Bit Rx Counter
MSB
LSB
Tx Counter Latch
Rx Counter Latch
Reference Counter Latch
15–Bit Mode Control Latch
Threshold Control Latch
7–Bit Auxillary Latch
12–Bit Reference Counter
MSB
LSB
U.K. Base
Select
2–Bit
Clk Out
Select
Stdby
Mode
4–Bit
Volume
Control
Rx
Mode
Tx
Mute
Rx
Mute
SP
Mute
5–Bit CD Threshold Control
U.K. Handset
Select
ALC
Disable
Not
Used
Limiter
Disable
Clk
Disable
4–Bit Test
Mode
3–Bit 1st LO
Capacitor Selection
Reference Frequency Selection
The “LO2 In” and “LO2 Out” pins form a reference oscillator
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.
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Crystal
Frequency
Divider
Value
Handset
Divider
2048
1
Reference
Frequency
10.24 MHz
5.0 kHz
10.24 MHz
1024
4
2.5 kHz
11.15 MHz
2230
1
5.0 kHz
12.00 MHz
2400
1
5.0 kHz
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11.15 MHz
1784
1
6.25 kHz
11.15 MHz
446
4
6.25 kHz
11.15 MHz
446
25
1.0 kHz
Reference Counter
Figure 17 shows how the reference frequencies for the Rx
and Tx loops are generated. All countries except U.K. require
that the Tx and Rx 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 Tx and Rx
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 Tx and Rx.
For U.K. base operation, set “U.K. Base Select” to “1”. For
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 Tx and Rx 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 Tx and Rx reference. Then set the reference
divider to 1024 to get a total divider of 4096.
Mode Control Register
Power saving modes, mutes, disables, volume control,
and microprocessor clock output frequency are all set by the
Control Register. Operation of the Control Register is
explained in Figures 18 through 25.
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