The On-Bright OB39S08 A3 datasheet details the 8‑bit controller’s features, pin configurations, registers, and electrical specifications.
The OB39S08 A3 is an 8‑bit microcontroller with a 1T architecture that runs up to 25 MHz and includes 8 KB of flash, 1 KB of additional flash, and 512 B of RAM. It offers a rich set of peripherals such as three 16‑bit timers, UART, I²C, SPI, PWM channels, ADC, comparators, and a programmable watchdog.
The document provides a complete product catalog, pin‑out tables, system block diagram, detailed register maps, and electrical characteristic tables. It also describes the reset behavior, power‑management modes, and programming options via internal ISP.
| Operating voltage | 1.8 V ~ 5.5 V |
|---|---|
| Flash memory | 8 KB + 1 KB |
| RAM | 512 B |
| Maximum CPU clock | 25 MHz |
| GPIO pins | 12 ~ 18 |
The controller operates from 1.8 V to 5.5 V.
It includes 8 KB of flash plus an additional 1 KB.
The CPU can run up to 25 MHz.
The device has three 16‑bit timers/counters (Timer0, Timer1, Timer2).