(1 PC) EM78P156EP EMC 8-bit RISC microcontroller PDIP18

8-bit RISC microcontroller PDIP18

The EM78P156EP is a classic 8-bit microcontroller manufactured by ELAN Microelectronics (often branded as EMC). It is widely utilized in consumer electronics, toys, and simple embedded systems, primarily notable for featuring a One-Time Programmable (OTP) Read-Only Memory.

Core Specifications Architecture: 

8-bit RISC Memory: 1K × 13-bit OTP ROM and 48 × 8-bit SRAM

Operating Voltage: 2.5 V ~ 5.5 V

Operating Frequency: DC up to 20 MHz

I/O Pins: 12 bi-directional I/O pins (packaged in an 18-pin DIP or SOP format)

Peripherals: 8-bit real-time clock/counter, external interrupt, and multiple sleep/power-down modes for low power consumption

Important Considerations Programming: 

Being an OTP microcontroller, it requires a specialized programmer (historically the "EMC Writer") to burn the code. Once programmed, it generally cannot be erased or reprogrammed.