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STMicro 8-bit microcontrollers feature expanded memory

Posted: 01 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? upsd3200? upsd325x? upsd321x? microcontroller?

STMicroelectronics has expanded the memory capacities of its ?PSD3200 family of 8-bit Flash 8051-based microcontrollers that are used for embedded systems such as PoS peripherals, alarm systems, and industrial control equipment.

Already providing up to 288KB of Flash memory, the ?PSD325x devices have expanded their SRAM from 8KB to 32KB for storing large variable sets and buffering large amounts of data to accelerate data transfer between USB and UART channels.

The ?PSD321x, also known as ?PSD Lite, provides 80KB of Flash memory, as well as 2KB of SRAM and addresses the lower-end applications that do not require large amounts of memories.

Based on the company's Programmable System Device architecture, the ?PSD3200 devices feature dual independent banks of Flash memory up to 256KB and 32KB, respectively, capable of concurrent R/W operation. They also feature SRAM and >3,000 gates of programmable logic with 16 macrocells.

The 8032 peripheral set includes two UART channels, five 8-bit PWM units, four 8-bit ADC channels, an I?C master-slave interface, supervisory functions such as a watchdog timer, and up to 46 GPIO pins.

Also included into the ?PSD3200 devices is a JTAG interface for programming and support for in-application programming. Dual banks of Flash memory and programmable decode logic allow the 8032 controller to run from one Flash bank while erasing and updating the other bank.

Memory mapping is handled by an integrated decoding PLD that can assign any Flash or SRAM memory segment to any address on any memory page, or bank. Additionally, Flash memory can be allocated to 8032 code space or data space in almost any proportion as needed.

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