STMicroelectronics ST6 Series Microcontrollers

1. Overview

The ST6 series was a family of 8-bit microcontrollers introduced by STMicroelectronics in the 1990s. It succeeded the ST62 series and was widely used in industrial, consumer, and automotive applications.

2. Key Features

• 8-bit Harvard architecture
• ROM, OTP, or EPROM memory options
• Clock speed ranging from 4 MHz to 8 MHz
• Low-power operation (3V to 5V supply)
• Efficient 8-bit instruction set
• Multiple on-chip peripherals

3. Onboard Peripherals

(a) Timers & Counters

• 8-bit timers for basic timing functions
• Watchdog Timer (WDT) for system reliability
• PWM Generator for motor control

(b) Analog Peripherals

• 8-bit ADC (Analog-to-Digital Converter) for sensor interfacing
• Comparator for analog signal comparison

(c) Communication Interfaces

• I²C for multi-device communication
• SPI for high-speed peripheral interfacing
• UART for serial communication

(d) Memory & Storage

• ROM / OTP / EPROM for program storage
• EEPROM for non-volatile data storage

(e) GPIO (General-Purpose I/O)

• Configurable I/O pins with multiple functions
• Interrupt-driven inputs for event detection

(f) Other Features

• Brown-Out Detection (BOD) to prevent power instability
• Low-power sleep modes for battery efficiency

4. ST6 Series Variants

Model	Flash/ROM Size	RAM	ADC	Timers	Communication	Notes
ST62T10	2K	128B	No	1x 8-bit	No	Basic MCU
ST62T25	4K	192B	8-bit ADC	2x 8-bit	SPI, UART	Industrial & automotive
ST62E40	8K	256B	8-bit ADC	2x 8-bit	I²C, SPI	OTP variant
ST62T60	16K	512B	8-bit ADC	3x 8-bit	I²C, UART, SPI	High-end MCU

5. Applications

• Home Appliances: Washing machines, microwave ovens
• Automotive: Dashboard controls, lighting systems
• Industrial: Motor controllers, process automation
• Consumer Electronics: Remote controls, smart toys

6. Transition to ST7 Series

The ST6 family was later succeeded by the ST7 series, which introduced flash memory, enhanced performance, and expanded peripheral options.