MC33218A

7

MOTOROLA ANALOG IC DEVICE DATA

Figure 2. Serial Port Timing Diagram

NOTES: 1. Maximum clock and data rate is 1.0 MHz. There is no required minimum rate.

2. B7 is to be entered first, B0 last.

3. Data is entered on the clock rising edge.

4. Clock can continue to toggle after B0 is entered if Data Ready goes high before the clock’s next rising edge.

This is not recommended due to possible noise problems.

5. Upon power up, all bits are internally set to logic 0, by the POR pin.

6. Data Ready must go low before the first falling clock edge after the clock rising edge associated with B7.

See text for additional information.

B7

t2

Data Ready

Clock

Data In

t5

B6

B5

B4

B3

B2

B1

B0

t1

t3

t4

SERIAL PORT CONTROL BITS

Bits

Code

Function

B7, B6

00

01

10

11

Normal voice switched operation

Force to receive mode

Force to idle mode

Force to transmit mode

B5

0

1

Attenuator range is 53 dB

Attenuator range is 27 dB

B4

0

1

Microphone amplifier is active

Microphone amplifier is muted

B3–B0

(Note 1)

0000

1111

Maximum receive volume

Minimum receive volume

NOTE: 1. Bit B0 is the LSB for the volume control.

Freescale Semiconductor, Inc.

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