The S3C7238/C7235 is a high-performance single-chip CMOS microcontroller with Samsung's newest 4-bit CPU core, SAM47. It features LCD direct drive capability, 8-bit timer/counter, and serial I/O, making it an excellent solution for applications that require LCD functions. Up to 40 pins of the 80-pin QFP package can be used for I/O. It has six vectored interrupts for fast response to internal and external events. The advanced CMOS technology ensures low power consumption and a wide operating voltage range.
The S3C7238, S3P7238, C7235 and P7235 are single‑chip CMOS microcontrollers built around Samsung's newest 4‑bit CPU core, SAM47. They offer LCD direct‑drive capability, 8‑bit timers/counters, serial I/O, and up to 40 I/O pins in an 80‑pin QFP package, making them suitable for applications requiring integrated LCD functions.
Key features include 512 × 4‑bit RAM, 8 KB or 16 KB ROM depending on the variant, multiple interrupt sources, power‑down modes, and a flexible clock system with a typical 4.19 MHz main clock and a 32.768 kHz subsystem clock. Detailed pin assignments, circuit diagrams, and OTP programming procedures are also provided.
| CPU core | 4‑bit SAM47 |
|---|---|
| Package type | 80‑pin QFP |
| Operating temperature | -40 °C to 85 °C |
| Main system clock | 4.19 MHz (typical) |
| Subsystem clock | 32.768 kHz |
| RAM | 512 × 4‑bit |
| ROM (S3C7238/P7238) | 8 KB × 8‑bit |
| ROM (S3C7235/P7235) | 16 KB × 8‑bit |
| LCD direct‑drive capability | Maximum 16‑digit, 32 segment, 4 common pins |
Up to 40 pins of the 80‑pin QFP package can be dedicated to I/O.
The typical main system clock frequency is 4.19 MHz.
It supports direct drive of up to 16 digits, with 32 segment lines and 4 common pins, and offers several duty/bias modes.