MC13110A datasheet(50/68 Pages) MOTOROLA

Part #	MC13110A

Description	UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC

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Manufacturer	MOTOROLA [Motorola, Inc]

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MC13110A/B MC13111A/B

50

MOTOROLA ANALOG IC DEVICE DATA

Figure 120. Power Saving Application – Option 2 (MC13110A/MC13111A Only)

MPU Clk

Divider

Clk In

SPI Port

Clk Out

SPI Port

LO2 Out

LO2 In

MC13110A/

MC13111A

Microprocessor

CD Out/

HW Interrupt

Interrupt

External Timer

VCC

Mode

EN

CD Out/Hardware Interrupt

MPU Clock Out

CD Out Low

Delay after MPU selects Inactive Mode to when CD turns off.

CD Turns Off

External Timer

Pulls Pin Low

MPU Initiates

Mode Change

Timer Output

Disabled

MPU Initiates

Inactive Mode

“MPU Clock Out” remains active for a minimum of one count of reference

counter after “CD Out/Hardware Interrupt” pin goes high

Active/Rx

Inactive

Interrupt

Standby/Rx/Active

MPU “Clk Out” Divider Programming

The “Clk Out” signal is derived from the second local

oscillator. It can be used to drive a microprocessor (MPU) clock

input. This will eliminate the need for a separate crystal to drive

the MPU, thus reducing system cost. Figure 121 shows the

relationship between the second LO crystal frequency and the

clock output for each divide value. Figure 122 shows the “Clk

Out” register bit values. With a 10.24 MHz crystal, the divide by

312.5 gives the same clock frequency as a clock crystal and

allows the MPU to display the time on a LCD display without

additional external components.

Figure 121. Clock Output Values

Crystal

Clock Output Divider

Crystal

Frequency

2

2.5

3

4

5

20

80

312.5

10.24 MHz

5.120 MHz

4.096 MHz

3.413 MHz

2.560 MHz

2.048 MHz

512 kHz

128 kHz

32.768 kHz

11.15 MHz

5.575 MHz

4.460 MHz

3.717 MHz

2.788 MHz

2.230 MHz

557 kHz

139 kHz

35.680 kHz

12.00 MHz

6.000 MHz

4.800 MHz

4.000 MHz

3.000 MHz

2.400 MHz

600 kHz

150 kHz

38.400 kHz

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