ST7261 is a low speed USB 8-bit MCU with 3 endpoints, ROM memory, LVD, WDG and timer.
The ST7261 is a low‑speed USB 8‑bit microcontroller from STMicroelectronics, featuring 4 KB ROM, 256 B RAM, USB, watchdog, low‑voltage detector and a time‑base unit. It operates from 4.0 V to 5.5 V and supports CPU frequencies up to 8 MHz with internal oscillators.
The document includes an introduction, pin description, PCB layout recommendations, register and memory maps, CPU details, clock and reset information, interrupt handling, power‑saving modes, on‑chip peripheral descriptions, electrical and mechanical characteristics, ordering information, an errata sheet, and device marking details.
| Program memory | 4 KB ROM |
|---|---|
| RAM (stack) | 256 bytes (128 byte stack) |
| Operating supply voltage | 4.0 V to 5.5 V |
| CPU frequency | Up to 8 MHz (with 6 or 12 MHz oscillator) |
| Operating temperature | 0 °C to +70 °C |
| Package types | PDIP20 / SO20 |
| Peripherals | USB, Watchdog, Low Voltage Detector, Time Base Unit |
The device operates from 4.0 V to 5.5 V.
It provides 11 multifunctional bidirectional I/O lines.
It complies with the USB 1.5 Mbit/s low‑speed specification (USB 1.1).