STMicroelectronics STR91X-SK/HIT

Overview

STR91X-SK/HIT from STMicroelectronics is a Hitex-branded starter kit for STR91xF ARM966E-S-based microcontrollers, featuring an STR912FW4 target MCU, on-board 2× UART, CAN, SPI, I²C, ADC, 2×7-segment LEDs, 5 user buttons, JTAG debug interface, and integrated Tantino USB-JTAG in-circuit debugger/programmer.

For engineers reviewing the STR91X-SK/HIT datasheet, STR91X-SK/HIT pinout, STR91X-SK/HIT application, or STR91X-SK/HIT equivalent, this kit supports rapid evaluation of ARM9-based real-time control, industrial connectivity, and embedded networking features with full HiTOP IDE integration and GNU C/C++ toolchain support.

Technical Context

The STR91X-SK/HIT implements a complete hardware-software development environment centered on the STR912FW4 - a 96 MHz ARM966E-S core MCU with 256 KB Flash, 96 KB SRAM, and peripheral set including Ethernet MAC (with external PHY support), USB 2.0 OTG, dual CAN 2.0B, 8-channel 10-bit ADC, and multiple serial interfaces.

HiTOP IDE drives the Tantino debugger via USB and provides source-level debugging, flash programming, and real-time trace capability for STR9 MCUs with Embedded Trace Macrocell (ETM); GNU C/C++ compiler included supports full-size application builds without code-size restriction.

Key Specifications

Availability

STR91X-SK/HIT is available at Aetrix Electronics and suitable for industrial automation prototyping, embedded networking evaluation, and ARM9-based real-time control development requiring stable component supply and long-term toolchain continuity.

Supply support for STR91X-SK/HIT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, power management, sensors, and automotive ICs, with broad industrial and embedded design infrastructure.

The STR91x product line targets high-performance ARM9-based applications in industrial control, networking gateways, and real-time communication systems, emphasizing deterministic execution, rich peripheral integration, and legacy toolchain compatibility.

FAQ

Does STR91X-SK/HIT include an Ethernet PHY?

No. The STR912FW4 MCU includes an integrated Ethernet MAC controller, but the STR91X-SK/HIT board does not include an external PHY chip or RJ45 connector. Ethernet functionality requires adding a compatible PHY (e.g., LAN8720A) and magnetics to the board's footprint.

What debugging capabilities does the Tantino tool provide for STR912FW4?

The Tantino USB-JTAG interface supports full SWD/JTAG debugging, flash programming, real-time variable monitoring, breakpoint setting, and ETM trace capture for STR912FW4 when used with HiTOP IDE - enabling cycle-accurate analysis of instruction flow and peripheral interaction.

Is the GNU C/C++ compiler included with STR91X-SK/HIT fully featured?

Yes. The GNU toolchain provided with STR91X-SK/HIT is unrestricted: it supports full-size application builds, link-time optimization, and all standard C99/C++03 features required for STR912FW4 firmware development without licensing or code-size limitations.

Can STR91X-SK/HIT be used for CAN FD development?

No. The STR912FW4 integrates only classical CAN 2.0B controllers (not CAN FD). The board's CAN transceivers and routing are compliant with ISO 11898-2, supporting up to 1 Mbps operation but no CAN FD data-rate arbitration or extended frame formats.