8051-based microcontrollers with programmable logic
20 November 2002
DSP, Micros & Memory
STMicroelectronics has introduced the µPSD3200 family of embedded Flash 8051-based microcontrollers. The devices feature large, dual-bank Flash memories, a large SRAM, Flash-based programmable logic and JTAG in-system programming (ISP). The family's 40 MHz 8032 core supports USB and many other on-chip peripherals making these devices a complete solution for a broad variety of embedded control applications. With up to 288 KB of Flash memory and 8 KB of SRAM, ST claims it offers the largest memory densities for an 8051-class MCU available today. A US$149 development kit coupled with third-party development tools is everything required to implement and validate a design.
The flagship device in the family, the µPSD3234A, features dual independent banks of Flash memory (256-Kbyte and 32-Kbyte) capable of concurrent read-write operation, 8 KB of SRAM, and over 3000 gates of programmable logic with 16 macrocells. The 8032 peripheral set includes a USB interface, two UART channels, four 8-bit PWM units, four 8-bit ADC channels, an I2C master-slave interface, a data-display channel (DDC), supervisory functions such as a watchdog timer and low-voltage detect, and up to 50 general-purpose I/O pins. The 80-pin TQFP versions allow connection of the 8032-address/data bus to external parallel peripherals. A 52-pin TQFP version is available without this bus access.
µPSD also supports in-application programming (IAP). Dual banks of Flash memory, and a special control register 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, which is a feature unique to µPSD devices. Designers can use the 16-macrocell PLD to replace external glue logic devices such as 22V10 PLDs, 20L8 PALs, and 74-series discrete logic ICs. Common functions forged from the PLD array include state machines, shifters and counters, keypad and control panel interfaces, chip-selects for external devices, clock dividers, multiplexers and handshake delay circuits. The µPSD3200 devices are ideally suited for embedded systems that require large amounts of code and/or data storage, such as point-of-sale peripherals: check/card readers, thermal printers, bar code scanners, and vending machine controllers. Other applications are equally supported such as building security, alarm, and access control, industrial control, portable GPS, public phones, and instrumentation. The devices come in 52-pin and 80-pin TQFP packages, with industrial operating temperature at 5,0 V and 3,3 V.
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