PIC16C56-HSI/SS
PIC16C56-HSI/SS - 8-bit EPROM MCU, 1KB, 12 I/O, SSOP-20 | Microchip
The Microchip Technology PIC16C56-HSI/SS is a member of the original PIC16C5X family of 8-bit CMOS RISC microcontrollers, offered in a 20-pin SSOP (Shrink Small Outline Package, 5.30 mm body width) with industrial temperature grade. The HSI suffix indicates a high-speed internal oscillator variant and the SS suffix denotes the SSOP-20 package; the device integrates 1.5 KB of one-time-programmable (OTP) EPROM program memory and 25 bytes of general-purpose SRAM in a 20-pin microcontrollable footprint with 12 GPIO pins.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces (timers, interrupts, I/O) onto one die. The PIC16C5X baseline architecture belongs to the RISC (Reduced Instruction Set Computer) microcontroller family, which is the parent class for PIC16F, PIC18, and dsPIC devices. Within that taxonomy, the PIC16C56 sits below PIC16C55 (smaller memory variant) and above PIC16C57 (larger memory variant), all sharing the same 12-bit instruction word and 8-bit data path. This baseline MCU category is widely used in cost-sensitive, deterministic embedded applications such as appliance control, sensor interfaces, and simple timers.
Key specifications of the PIC16C56-HSI/SS include a maximum clock speed of 20 MHz (with instruction cycle time of 200 ns at 20 MHz, derived from a four-clock-per-instruction design), 12-bit wide instructions, an 8-bit wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct/indirect/relative addressing modes for both data and instructions. The device integrates an 8-bit real-time clock/counter (TMR0), a watchdog timer (WDT), and Power-on Reset (POR). Operating voltage spans 4.5 V to 5.5 V with a 5.0 V nominal supply, and the part is rated for the industrial temperature range of -40 °C to +85 °C.
From a system-architecture perspective, the PIC16C56-HSI/SS uses a Harvard memory architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. Its 12-bit instruction set is highly symmetrical, achieving roughly 2:1 code compression versus competing 8-bit microcontrollers in the same class (per Microchip PIC16C5X family documentation). The HSI oscillator option eliminates the need for an external crystal at lower accuracy, reducing BOM cost and PCB area in cost-driven designs.
Typical applications include low-cost consumer appliance controllers, battery chargers, simple sensor signal conditioning, LED lighting controllers, and replacement of discrete logic in timing and sequencing circuits. The 12 GPIO pins support direct drive of small relays, LEDs, and logic-level peripherals, while the integrated TMR0 and WDT provide deterministic timing and recovery from software lockups.
When designing with this part, note that the EPROM program memory is one-time programmable (OTP); for field firmware updates, choose the PIC16F or PIC16C variants with flash/EPROM that can be reprogrammed, or use a JW windowed package for development. Decoupling: place a 0.1 µF ceramic bypass capacitor as close as possible to the VDD pin to suppress switching noise on the internal logic.
This page synthesizes distributor pricing, drop-in SSOP-20 alternatives from the same PIC16C5X family, and practical design notes that are not aggregated on any single manufacturer or distributor page.
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