PIC16C56-HS/P
PIC16C56-HS/P - 8-bit 20MHz OTP MCU, 1.5KB, PDIP-18 | Microchip
The Microchip Technology PIC16C56-HS/P is an 8-bit EPROM/ROM-based CMOS microcontroller (MCU) from the PIC16C5x family, supplied in a through-hole 18-pin PDIP package. It integrates 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, and executes instructions at a maximum clock speed of 20 MHz using the high-speed ('HS') oscillator mode. The PIC16C5x core uses a RISC architecture with 33 single-word, single-cycle instructions, providing 2:1 code compression over competing 8-bit MCUs in its class.
What is an 8-bit OTP microcontroller? An OTP microcontroller is a single-chip computer that integrates a CPU, RAM, ROM/EPROM (program memory), and peripherals on one die. The 'OTP' suffix means the on-chip program memory can be written once by the user with a device programmer (typically using EPROM cells) and cannot be electrically erased afterward, making OTP MCUs the lowest-cost option for moderate-volume production. 8-bit OTP MCUs sit at the lowest tier of the microcontroller hierarchy: microcontroller -> embedded controller -> semiconductor -> integrated circuit. They are widely used in cost-sensitive, low-power, deterministic-control applications such as consumer appliances, sensors, and simple timing/logic-replacement roles.
Key features of the PIC16C56-HS/P include a 12-bit instruction word with 8-bit data path, two-level deep hardware stack, direct/indirect/relative addressing for data and code, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, and a watchdog timer for unattended operation. The HS oscillator mode supports high-frequency crystal or resonator operation up to 20 MHz, while the wide 3.0V-5.5V supply range allows operation from a single Li-cell or regulated 5V rail. Compared with other PIC16C5x variants, the 'C56' is the OTP-programmable member and the 'HS' designator specifies the high-speed oscillator option rather than the low-power ('LP') or resistor/capacitor ('RC') modes.
Architecturally, the PIC16C56-HS/P uses a Harvard-style memory map with separate program and data buses, allowing instruction fetch and operand access in the same cycle. Its 12-bit-wide instruction set, fixed-format 33-instruction core, and deterministic 4-clock (200 ns at 20 MHz) instruction cycle make code execution timing fully predictable, which simplifies real-time control loops. Because the program memory is EPROM-based and the part is in PDIP, it is intended for development, prototyping, and low-to-moderate-volume production where windowed ceramic or reprogrammable Flash devices are not required.
Typical applications include appliance controllers, sensor signal conditioning front-ends, simple PWM/fan controllers, LED lighting drivers, security keypads, and any battery-powered device that needs deterministic 8-bit control with low active current. Because the package is through-hole PDIP-18 and the device is mature, the part is also frequently used for legacy board repair and educational/learning platforms. Microchip marks the broader PIC16C56 family as 'Not Recommended for new designs' (NRND), so new designs should normally target the Flash-based PIC16F or enhanced PIC16C5x successors.
When designing with this part, ensure the selected crystal or resonator matches the HS oscillator's load-capacitance specification, place decoupling capacitors (typically 0.1 uF) close to VDD/VSS pins, and reserve the MCLR pin for a proper reset circuit. Because the program memory is OTP, firmware must be fully validated in windowed or emulation parts before committing to PIC16C56-HS/P production programming.
This page synthesizes current distributor pricing, drop-in PDIP-18 alternatives, and practical design notes that go beyond the manufacturer datasheet summary.
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