STMicroelectronics ST72F324BK6T6TR

Overview

ST72F324BK6T6TR from STMicroelectronics is an automotive-grade 8-bit MCU featuring 32 Kbyte HDFlash, 1024-byte RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI/SCI interfaces, and PLL-based clock multiplication - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.

For engineers reviewing the ST72F324BK6T6TR datasheet, ST72F324BK6T6TR pinout, ST72F324BK6T6TR application, or ST72F324BK6T6TR equivalent, key selection criteria include automotive temperature range (-40°C to +125°C), LQFP44 package compatibility, HDFlash endurance (100 write cycles), nested interrupt controller with 10 vectors, and low-voltage supervisor with programmable reset thresholds.

Technical Context

This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates crystal/ceramic resonator oscillators, internal RC oscillator, external clock input, and a 2× PLL multiplier - enabling precise timing control across variable operating conditions.

The interrupt subsystem supports nested servicing with 10 dedicated vectors plus TRAP and RESET, and up to 9 external interrupt lines mapped across 4 vectors. Power management includes four low-power modes (Slow, Wait, Active Halt, Halt) with configurable wake-up sources including AVD interrupts and I/O port edge detection.

Key Specifications

Pinout & Package

LQFP44 (10 × 10 mm, 0.8 mm pitch) package with 32 multifunctional bidirectional I/O lines, 22 alternate function lines, and 12 high-sink outputs capable of 20 mA per pin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit automotive MCU applications.

Compared with ST72F324BK6T6TR, ST72F324BJ6T6TR offers identical functionality in the same LQFP44 package, while STM8AF5269TAY delivers higher performance and resolution at the cost of migration effort and loss of HDFlash write-cycle guarantees.

Availability

ST72F324BK6T6TR is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS sensor interface modules requiring stable component supply across extended automotive lifecycles.

Supply support for ST72F324BK6T6TR 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 automotive, industrial, and power management ICs, with over 40 years of microcontroller innovation and AEC-Q100 qualified product development.

The ST7 family was designed specifically for cost-sensitive, high-reliability automotive applications demanding robustness, low power, and deterministic real-time response - targeting ECU, BCM, and TCU implementations before the STM8 transition.

FAQ

What is the maximum operating frequency of the ST72F324BK6T6TR?

The ST72F324BK6T6TR achieves a maximum CPU frequency of 8 MHz using its internal PLL (2× multiplication) with an 4 MHz crystal input. Without PLL, the maximum external clock frequency is 8 MHz, and the internal RC oscillator operates at 1 MHz ±10% across temperature and voltage ranges.

Does this MCU support in-circuit programming (ICP)?

Yes, the ST72F324BK6T6TR supports in-circuit programming via the ICC interface using the ICCSEL/VPP pin. It requires a dedicated ST programming adapter and compatible software (e.g., ST Visual Programmer), with no external HV supply needed for standard ICP operations.

Is the 10-bit ADC differential or single-ended?

The 10-bit ADC is single-ended only, with up to 12 input channels selectable via software-controlled multiplexer. It does not support true differential input pairs or built-in PGA; reference voltage is internally derived from VDD or externally applied to VREFH/VREFL pins.

What debug interface does the ST72F324BK6T6TR provide?

The device supports in-circuit testing (ICT) capability via the ICC interface, enabling non-intrusive memory access and register inspection. It lacks SWIM or JTAG; debugging relies on ST's proprietary ICC protocol using dedicated pins (ICCCLK, ICCDAT, ICCSEL/VPP) and vendor-specific tools.