MC13109AFTA View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC13109AFTA

Universal Cordless Telephone Subsystem IC

Motorola => Freescale 

MC13109A

Figure 11. Microprocessor Interface Data Latch Registers

Latch Address

MSB

14–Bit Tx Counter

LSB

1. (00000001)

Tx Counter Latch

MSB

14–Bit Rx Counter

LSB

2. (00000010)

Rx Counter Latch

U.K. Handset

Select

U.K. Base

Select

MSB

12–Bit Reference Counter

Reference Counter Latch

LSB 3. (00000011)

ALC

Not Limiter Clk

MPU

Disable Used Disable Disable Clk1

MPU

Clk0

MSB

14–Bit

Volume

Control

LSB

Stdby

Mode

Rx

Mode

Tx

Mute

Rx

SP

Mute Mute

Mode Control Latch

4. (00000100)

MSB

5–Bit CD Threshold Control

LSB

Threshold Control Latch

5. (00000101)

6. (00000110)

4–Bit Test Mode

3–Bit 1st LO

Capacitor Selection

7–Bit Auxillary Latch

7. (00000111)

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 12 shows the relationship between

different crystal frequencies and reference frequencies for

cordless phone applications in various countries.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Figure 12. Reference Frequency and

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Reference Divider Values

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Crystal

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Frequency

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 10.24 MHz

Reference

Divider

Value

2048

U.K. Base/

Handset

Divider

1

Reference

Frequency

5.0 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 10.24 MHz

1024

4

2.5 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 11.15 MHz

2230

1

5.0 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 12.00 MHz

2400

1

5.0 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 11.15 MHz

1784

1

6.25 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 11.15 MHz

446

4

6.25 kHz

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 11.15 MHz

446

25

1.0 kHz

Reference Counter

Figure 13 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 of 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 14 through 21.

MOTOROLA RF/IF DEVICE DATA

17

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