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MCUs enable new-gen 8bit performance

Posted: 14 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MCUs 8bit? application 16bit? STM8S MCU?

The new STM8S105 and STM8S207 MCUs from STMicroelectronics include high-performance 8bit architecture, modular peripherals and pin-compatible packages to raise performance, scalability, and value for current 8bit and 16bit applications.

The STM8S platform enables new generations of 8bit MCUs, offering up to 20 MIPS CPU capability and 2.95V to 5.5V operation to help legacy 8bit systems transition to lower supply voltages. Its 130nm embedded non-volatile memory is among the most advanced technologies currently in use with 8bit MCUs and provides true EEPROM data-write with 300,000-cycle durability.

The peripherals available support accurate control and monitoring in a broad range of products such as home appliances, HVAC systems, industrial automation, power tools, personal-care equipment, and systems for power control and management.

Functions include a 10bit ADC with up to 16 channels capable of converting in less than 3?s. There is also advanced 16bit control timers for operations such as motor control, capture/compare and PWM. Other peripherals include a CAN2.0B interface, two U(S)ARTs, an I?C and SPI ports.

The STM8S platform shares its peripherals' definition with the 32bit STM32 families. This promotes compatibility across devices and enables design flexibility. Applications can be migrated into the STM32 domain for higher performance.

Complementing this flexibility, STM8S components and packages are fully pin-compatible to provide more freedom for developers to optimize pin count and peripherals. Pin compatibility also allows platform-design decisions, which save time-to-market, and allow products to be quickly and easily upgraded.

Two on-chip RC oscillators, operating at 16MHz and 128kHz, are accurate to within 1 percent and 5 percent, respectively, and save the need for an external clock source. The MCU can switch between these two oscillators in less than 2?s.

On-chip Power-On-Reset and BOR (Brown-out Reset) functions eliminate external reset circuitry.

Further advantages include IEC61967-compliant EMI emission, IEC-1000 high immunity to susceptibility and high current-injection immunity, which saves external protection components normally required to meet EMC regulations.

In addition, compatibility with ST's embedded touch-sensing software allows STM8S MCUs to support flexible and inexpensive user interfaces comprising capacitive buttons, sliders and rotary switches with minimal external components. Software libraries are available for capacitive sensing functions.

Other features include a single-wire debug-and-programming interface, as well as single-voltage flash memory enabling in-application programming and in-system programming. Combined with the free software environment, the STM8 tool suite offers an inexpensive way to create applications.

Developers targeting the STM8S platform also benefit from tools including a starter kit, emulator, evaluation board and debugger. Additional development support includes a dedicated firmware library compliant to Class B, according to the IEC60335 functional safety standard.

Among the devices introduced, developers can choose the STM8S105 Access Line with 16MHz CPU frequency and up to 32Kbyte flash, or the STM8S207 Performance Line operating at 24MHz and up to 128Kbyte flash. Package options span 32-pin LQFP32 to 80-pin LQFP80. The price for the 32Kbyte STM8S105K6T6C in a LQFP32 package is $0.89 for quantities of 10,000 units.

- Toni McConnel

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