INTRODUCTION
This data sheet details the specific features of the: PCD5090/xxx; DSP-ROM, with external ROM PCA5097/xxx; DSP-ROM, with Field Electronically Erasable Programmable Read Only Memory (FEEPROM).

FEATURES
General
• The PCx509x is designed for GAP-compliant handsets and simple base stations
• Embedded 80C51 microcontroller with twice the performance of the classic architecture, up to 128 kbytes external memory or 64 kbytes FEEPROM program memory and 3 kbytes of data memory on chip. In addition there is 1 kbyte of on-chip data memory that is shared with on-chip Burst Mode Logic (BML) and DSP, the System Data RAM (SDR).
• 80C51 ports P0, P1, P2 and P3 available for interfacing to display, keyboard, I2C-bus, interrupt sources and/or external memory. External program memory is addressable up to 128 kbytes (PCD5090/xxx and PCA5097/xxx).
• Portable Part (PP) and Fixed Part (FP) modes
• TDMA frame (de)multiplexing; transmission or reception can be programmed for any slot
• Ciphering, scrambling, CRC checking/generation, protected B-fields
• Speech and data buffering space for six handsets
• Local call and B-field loop-back
• Two interrupt lines for BML and DSP to interrupt 80C51
• On-chip, three-channel time-multiplexed 8-bit Analog-to-Digital Converter (ADC) for RSSI measurement and battery voltage measurement. One channel available for other purposes.
• On-chip 8-bit DAC for frequency adjustment of 13.824 MHz on-chip crystal oscillator
• Phase error measurement and phase error correction by hardware
• Digital-to-Analog Converters (DACs) and ADCs for dynamic earpiece and dynamic or electret microphone
• On-chip reference voltage
• On-chip supply for electret microphone
• Very low ohmic buzzer output
• Serial interface to external ADPCM CODEC (PCD5032)
• IOM-2interface (Siemens registered trademark)
• Serial interface to synthesizer for frequency programming
• Programmable timing of radio-control signals
• Programmable polarity of radio-control signals
• Easy interfacing with radio circuits, operating at other supply voltage
• Programmable GMSK pulse shaper
• On-chip comparator for use as bit-slicer
• Power-on reset
• Low supply voltage (2.7 to 5.5 V)
• SACMOS technology.