TCM4400EPET datasheet(22/64 Pages) TI

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TCM4400E

GSM/DCS BASEBAND AND VOICE A/D

AND D/A RF INTERFACE CIRCUIT

SLWS082A – JULY 1999 – REVISED MARCH 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

microcontroller serial interface timing considerations

Figure 3 shows the timing diagram for the microcontroller serial interface.

The microcontroller serial interface is designed to be compliant with 8-bit standard synchronous serial ports.

The microcontroller operates on 16-bit words; this interface consists of four pins.

UCLK:

A clock provided by the microcontroller to control access to baseband, voiceband, and auxiliary

functions registers

UDR:

An input terminal to control read and write access to baseband, voiceband, and auxiliary functions

registers

UDX:

An output terminal to transmit data from read access of baseband, voiceband, and auxiliary

functions registers

USEL:

An input terminal to enable read and write access to baseband, voiceband, and auxiliary functions

registers through the microcontroller interface

tsu10

th10

tsu11

th10

tv2

th11

th9

tv1

th12

Hi-Z

USEL

UCLK

UDR

UDX

Figure 3. Microcontroller Serial Interface Timing Waveforms

(Mode Rising Edge Without Delay)

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