Modes of Operation

The UT4U UT4RM operates in seven cellular modes and a local mode for service - Analog Control Channel (ACCH) 800 MHz Mode, - Analog Voice Channel (AVCH) 800 MHz Mode, - Digital Control Channel (DCCH) 800 MHz Mode, - Digital Traffic Channel (DTCH) 800 MHz Mode, - Digital Control Channel (DCCH) 1900 MHz Mode, - Digital Traffic Channel (DTCH) 1900 MHz Mode, - Locals mode, used by Production and After Sales. On analog control channel mode the phone receives continuous signalling messages on Forward...

Vcxo

Both MAD and CCONT include a watchdog, and both use the 32 kHz sleep clock. The watchdog in MAD is the primary one, and this is called SW-watchdog. MCU has to update it regularly. If it is not updated, logic inside MAD gives reset to mAd. After the reset, MCU can read an internal status bit to see the reason for reset, whether it was from MAD or CCONT. The SW-watchdog delay can be set between 0 and 63 seconds at 250 millisecond steps and after power-up the default value is the max. time. MAD...