GENERAL DESCRIPTION

The PCD509x2 family is designed for low power GAP compatible DECT handset (PP) and base station (FP) applications. The circuit includes the audio interface, the DSP, the microcontroller and the Burst Mode Logic, and contains all functionality to convert speech and data signals from/to the analog side (microphone and earpiece or line interface circuit) to/from the radio side (1.152 Mbits/s data).

FEATURES

• The PCD50912 is designed for GAP compatible DECT handsets

• The PCD50922 is designed for GAP compatible DECT base stations serving up to six handsets

• Fully static 80C51 microcontroller

• Emulation supported for 80C51 program development

• Four 8-bit ports (P0, P1, P2 and P3), 32 I/O lines

• Dedicated port pins for keyboard, I2C-bus, interrupt sources and/or external memory

• Fifteen interrupt sources (including those from TICB, BML and DSP) with two priority levels

• I2C-bus interface

• UART with IrDA-compatible Data Transmission Mode

• 256 bytes of microcontroller main RAM

• 3 kbytes of microcontroller AUX RAM

• 1 kbyte of shared System Data RAM

• 64 kbytes of mask programmable ROM

• 128 kbyte address space for external ROM access, maximum 192 kbytes together with internal ROM

• 128 kbytes of external RAM addressable

• Embedded DSP with 6.912, 13.824 or 27.648 Mips

• Speech and IOM-2 interface

• BML for TDMA frame (de)multiplexing. Transmission or reception can be programmed for any slot

• Ciphering, scrambling, CRC checking/generation, protected B-fields

• Local call and B-field loop-back

• Automatic receiver delay adjustment programmable per slot to correct for terminal mobility

• Phase error measurement and phase error correction by hardware

• Serial interface to synthesizer for frequency programming

• Programmable timing and polarity of radio-control signals

• Easy interfacing with radio circuits, operating at different supply voltages

• GMSK pulse shaper with two different pulse shapes (BT = 0.5 and BT = 0.8)

• Comparator for use as bit-slicer

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