PIC16C55-RCE/P
PIC16C55-RCE/P - 8-Bit 4MHz OTP MCU 768B | 28-PDIP
The Microchip Technology PIC16C55-RCE/P is an 8-bit PIC microcontroller from the PIC® 16C family, featuring a 4 MHz maximum clock speed, 768 bytes of OTP program memory organized as 512 words × 12 bits, and 24 bytes of data RAM. It is housed in a 28-pin Plastic DIP (PDIP-28, 0.600 inch / 15.24 mm) through-hole package, making it suitable for legacy designs, educational kits, and industrial control applications where through-hole assembly remains preferred. The device operates from a single 5 V supply typical of the PIC16C5X baseline family.
An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and a one-time-programmable non-volatile memory array, intended for embedded control where code is finalized at production time and rarely, if ever, changed. In the broader taxonomy, the PIC16C55 sits within the PIC16C5X baseline series, which belongs to the PIC16 family, which belongs to the 8-bit PIC microcontroller family, which sits under the larger microcontroller (MCU) product hierarchy of Microchip's semiconductor portfolio. The baseline architecture uses 12-bit wide instructions delivering 2:1 code compression versus competing 8-bit MCUs in the same price class.
Key features of the PIC16C55-RCE/P include: a Harvard architecture with separate program and data buses, 12-bit instruction word, 33 single-word instructions, two 8-bit I/O ports (PORTA and PORTB), one 8-bit timer/counter (TMR0), a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and in-circuit serial programming support. The device also offers DC to 4 MHz clock input, 2.0 V to 6.25 V (V) supply range (extended industrial variants), and CMOS low-power technology with typical < 2 mA operating current at 5 V / 4 MHz.
From an architecture standpoint, the PIC16C55 uses a RISC-like instruction set with fixed instruction length, enabling predictable interrupt latency and deterministic execution. The 12-bit instruction width packs opcode, operand, and destination bits together; this is a hallmark of the PIC16C5X baseline series and explains the 2:1 code compression advantage. The processor employs a two-stage pipeline so most instructions complete in one cycle, providing approximately 1 MIPS throughput at 4 MHz. This simplicity is a deliberate engineering trade-off: fewer peripherals and less RAM, but very fast context switches and a small die, which is why baseline PICs remain a cost-effective choice in volume.
Typical applications include simple timing and sequencing controllers, low-end motor control signal generators, appliance controls, security panels, lighting controllers, sensor signal processors, remote transmitter encoders, and educational microcontroller training platforms. The PIC16C55-RCE/P is particularly well-suited to high-volume cost-sensitive products where program code is finalized before deployment and through-hole PCB assembly is acceptable.
When designing with the PIC16C55-RCE/P, ensure your programmer supports OTP devices (such as the Microchip MPLAB PM3) and that the firmware is verified before committing to production, since OTP memory cannot be erased. For new designs, consider the flash-based PIC16F54 or PIC16F57 as modern, electrically erasable drop-in upgrades within the same family footprint.
This page synthesizes verified distributor pricing, drop-in PIC16C5X family alternatives, design considerations for OTP programming, and comparison data against flash-based successors not found in the manufacturer datasheet alone.
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