GPRT5507A

GPRT5507A LANGUAGE REPEATER 1. GENERAL DESCRIPTION The GPRT5507A integrates an 8-bit CPU, speech generator, segment LED driver, analog switches, programmable attenuator and a gain amplifier into one chip. The GPRT5507A includes a 40K-byte ROM, 128-byte working SRAM, 4 edge-mode interrupts and a fixed time based generator (FCPU/1024)*. This chip which incorporated with 1 or 2 pieces of 4M X 4 ARAM, can be applied to the versatile audio field, such as a language repeater. *FCPU: CPU clock 2. FEATURES „ 8-bit microprocessor „ Provide 40K x 8 ROM area for program and audio data „ 128 x 8 working SRAM „ Embedded LPF, ADC, DAC for analog processing „ Provide controlled DRAM interfaces „ 4 Interrupt sources „ Built in watch dog timer „ ROSC. or Crystal OSC. selections „ Provide low battery detector „ Provide power down mode 3. BLOCK DIAGRAM XI, XO RESET CPU SRAM 128 x 8 MASK ROM 40K x 8 I/O DECODER LOW BATTERY POWER FAIL ARAM INTERFACE RAS, CAS1, CAS2, W, OE A11 .... A0 D3...