GENERAL DESCRIPTION
An ADPCM transcoder, a very low power CODEC and Analog Frontend is integrated. Direct connections towards microphone and a (dynamical) loudspeaker are provided. Duplex quality handsfree operation is integrated. A dedicated TDMA controller handles all physical layer slot formats and radio control. National Semiconductors standard CompactRISCTM CR16B 16 bit microcontroller takes care of all the higher protocol stack. 4 kilobyte F lash is integrated for parameter and number storage. n n n n n n n n n n n n n n n n n n n n n 3V upto 5.0V battery monitor input. Advanced battery management unit Very low power in active and paging mode. Embedded 16 bit CompactRISCT M Micro Controller. (CR16B) with programmable clock speeds. 4k byte memory mapped Flash 320 kbyte Flash or factory programmed ROM FLASH. ACCESSBUSTM or MICROWIRE T M interfaces 5,5 kilobyte on-chip Data Memory. One full duplex ADPCM transcoder. On-chip 14-bit linear CODEC. 14 upto 44 dB gain differential microphone input buffer.
National Semiconductor
