PIC16LC54A-04E/P
PIC16LC54A-04E/P - 4MHz, 512B EPROM 8-bit MCU | Microchip
The Microchip Technology PIC16LC54A-04E/P is an EPROM-based 8-bit CMOS microcontroller in the PIC16C5x family, delivering 4 MHz maximum clock speed with a 12-bit wide instruction word and 8-bit data path in an 18-pin PDIP (CERDIP, windowed, 0.300 inch) through-hole package. According to the manufacturer datasheet, the device integrates 512 x 12 words of one-time-programmable EPROM program memory, 25 bytes of general-purpose RAM, 12 digital I/O lines, and an 8-bit real-time clock/counter (TMR0). Supply voltage spans 3.0 V to 6.25 V with the 'LC' low-voltage CMOS process variant.
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus, optimized for embedded control tasks such as sensor reading, actuator driving, and simple state-machine logic. Within the semiconductor taxonomy, the PIC16LC54A belongs to the hierarchy: 8-bit microcontroller -> RISC microcontroller -> CMOS microcontroller -> embedded controller -> semiconductor. The PIC16C5x family uses a RISC-like instruction set with only 33 single-word/12-bit instructions, providing 2:1 code compression versus competing 8-bit MCUs in its class.
Key features include a two-level deep hardware stack, direct/indirect/relative data and addressing modes, seven or eight special function hardware registers, internal power-on reset, watchdog timer with on-chip RC oscillator, and programmable code protection. Programmable options select oscillator type (RC, XT, LP, HS) and enable watchdog timer, power-on reset, and code protection bits in the EPROM configuration word.
The PIC16LC54A architecture separates program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. Seven Special Function Registers (PCL, STATUS, FSR, PCLATH, INDF, TMR0, OPTION, plus EEDATA on some variants) control I/O, timing, and program flow. The device supports in-circuit serial programming and is compatible with Microchip's PICSTART Plus and MPLAB development tools, reducing time-to-prototype for new designs.
Typical applications include automotive body electronics, white goods and appliance controllers, low-end consumer products, and industrial control subsystems where small pin count, low power, and one-time-programmable memory are advantageous. The 'E' suffix denotes the extended automotive temperature grade (-40C to +125C) and 'P' denotes the PDIP package.
When designing with this device, allocate a watchdog timer enable window and configure the oscillator selection fuse carefully to match the chosen resonator. Note that windowed CERDIP packages expose the EPROM die to UV light, allowing erasure for prototyping but requiring opaque labels in production.
This page synthesizes current distributor pricing, verified drop-in alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
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