Introduction The ST20-GP6 is an application-specific single chip micro using the ST20 CPU with microprocessor style peripherals added on-chip. It incorporates DSP hardware for processing the signals from GPS (Global Positioning System) satellites. FEATURES ■ Application specific features • 12 channel GPS correlation DSP hardware, ST20 CPU (for control and position calculations) and memory on one chip • no TCXO required • RTCA-SC159 / WAAS / EGNOS supported ■ GPS performance • accuracy - stand alone with SA on <100m, SA off <30m - differential <1m - surveying <1cm • time to first fix - autonomous start 90s - cold start 45s - warm start 7s - obscuration 1s ■ Enhanced 32-bit VL-RISC CPU - C2 core • 16/33/50 MHz processor clock • 25 MIPS at 33 MHz • fast integer/bit operations ■ 64 Kbytes on-chip SRAM ■ 128 Kbytes on-chip ROM ■ Programmable memory interface • 4 separately configurable regions • 8/16-bits wide • support for mixed memory • 2 cycle external access ■ Programmable UART (ASC) ■ Parallel I/O ■ Vectored interrupt subsystem ■ Diagnostic control unit ■ Power management • low power operation • power down modes ■ Professional toolset support • ANSI C compiler/link driver and libraries • Debugging/profiling and simulation tools ■ Technology • Static clocked 50 MHz design • 3.3 V, sub micron technology ■ 100 pin PQFP package ■ JTAG Test Access Port APPLICATIONS ■ Global Positioning System (GPS) receivers ■ Car navigation systems ■ Fleet management systems ■ Time reference for telecom systems
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