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GENERAL DESCRIPTION

The ST9040is a ROM member of the ST9 family of microcontrollers, completely developed and produced by SGS-THOMSON Microelectronics using a proprietaryn-well HCMOS process.

■ Register oriented 8/16 bit CORE with RUN, WFI and HALT modes

■ Minimum instruction cycle time : 500ns (12MHz internal) Internal Memory : ROM 16K bytes RAM 256 bytes EEPROM 512 bytes

■ 224 generalpurposeregistersavailable as RAM,

■ accumulatorsor indexregisters(register file)

■ 80-pin PQFP package for ST9040Q

■ 68-lead PLCC packagefor ST9040C

■ DMA controller, Interrupt handler and Serial Peripheral Interface as standardfeatures

■ Up to 56 fully programmable I/O pins

■ Up to 8 external plus 1 non-maskableinterrupts

■ 16 bit Timer with 8 bit Prescaler, able to be used as a WatchdogTimer

■ Two 16 bit Multifunction Timers, each with an 8 bit prescaler and 13 operating modes

■ 8 channel 8 bit Analog to Digital Converter, with Analog Watchdogs and external references

■ Serial Communications Interface with asynchronous and synchronous capability

■ Rich InstructionSet and 14 Addressingmodes

■ Division-by-Zero trap generation

■ Versatile developmenttools, including assembler, linker, C-compiler, archiver, graphic oriented debuggerand hardware emulators

■ Real Time OperatingSystem

■ Windowedand OneTime ProgrammableEPROM parts available for prototyping and pre-production developmentphases

■ Pinto pincompatible with ST9036