The S3C72B5/C72B7/C72B9 is a single-chip CMOS microcontroller produced by Samsung Electronics, which uses a four-bit CPU core and has an LCD controller/driver with 80 SEG×16 COM and 88 SEG×8 COM terminals, as well as 32Kbyte ROM and 3584×4bit RAM.
The Samsung S3C72B5/C72B7/C72B9/P72B9 series are single‑chip CMOS microcontrollers built around the SAM47 4‑bit CPU core. They provide up to 1,280‑dot LCD direct‑drive capability, multiple timer/counter units, serial I/O, and a rich set of configurable I/O pins for versatile embedded designs.
The handbook details the device architecture, memory organization, register set, clock sources, power‑down modes, and peripheral functions such as LCD driving, comparator, and serial communication, and includes electrical characteristics for both standard and OTP versions.
| RAM | 3,584 × 4‑bit |
|---|---|
| ROM | 16,384 / 24,576 / 32,768 × 8‑bit |
| I/O Pins | 51 (47 configurable, 4 input) |
| Operating Temperature | 40 °C to 85 °C |
| Operating Voltage | 1.8 V to 5.5 V |
| Package | 128‑pin QFP |
| Main System Clock Frequency | 0.4 MHz to 6 MHz |
| Subsystem Clock Frequency | 32.768 kHz |
The device provides 51 I/O pins, of which 47 are configurable and 4 are input‑only.
They operate from 1.8 V up to 5.5 V.
It can directly drive up to a 1,280‑dot LCD panel with segment‑expandable circuitry.
The ROM is available in three sizes: 16 KB, 24 KB, or 32 KB of 8‑bit memory.