User's Manual

4.6.1.3 QSC Receive Timing

4.6.1.4 MSM Transmitting Timing

4.6.2 UART Data Interface

QSC6055 devices are capable of providing up to two universal asynchronous receiver

transmitter (UART) ports. Each UART communicates with serial data ports that conform

to the RS-232 interface protocol. With a properly written and user-defined download

program, the UART can be used as the handset’s serial data port for test and debug, and

can support additional interface functions such as an external keypad or ringer. If the

handset uses EEPROM or flash memory, then the UART can be used to load and/or

upgrade system software.

UART1 capability is expanded to include a high-speed (Up to 4 Mbps) mode.

4.6.3 Cellular Antenna Open/Short Sense

The phone module provides the antenna diagnostics function by the antenna detection cir-

cuit. The antenna detection circuit can detect three statuses: GOOD, OPEN and

SHORTED. The detection circuit senses current drain through anttena and sends analog

voltage to QSC. QSC reads analog voltage by its ADC and monitors the antenna status.