TCM4400E Datasheet, PDF (22/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
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
USEL
th10
tsu10
UCLK ^{ÏÏÏÏÏÏ}
tc
th11 _{ÏÏÏÏÏÏ}
th10
UDR ^{ÏÏÏÏÏÏÏÏÏÏtsu1ÏÏ1 ÏÏ}
tv2
th9
ÏÏÏÏÏÏ ÏÏÏÏÏÏÏÏÏÏÏÏ
tv1
th12
Hi-Z
Hi-Z
UDX
Figure 3. Microcontroller Serial Interface Timing Waveforms
(Mode Rising Edge Without Delay)
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