MC68HC705SR3CP

MC68HC705SR3CP is a member of the Motorola/Freescale/NXP 68HC05 family of 8-bit microcontrollers. It combines a 6805-compatible CPU with on‑chip program memory (ROM), data RAM, a serial communications interface (SCI), one or more timers, and basic I/O ports. It runs from a single supply (typical range ~1.7–5.5 V) and targets small, low‑cost embedded control tasks. Memory is modest (a few KB of ROM with hundreds of bytes of RAM in common variants); clock speeds are in the low MHz, depending on the exact device. It provides an interrupt system and a watchdog timer, plus basic low-power options in many configurations. Packaging ranges from small pins to larger packages.
Development is by assembly or C using standard 68HC05 toolchains (CodeWarrior, etc.). The SR3CP designation denotes a specific configuration in this family; for exact details—memory size, pin count, voltage, speed, and package—consult the official datasheet and user guide.

Here are typical features of the MC68HC705SR3CP (68HC705SR3 family) in concise form. Exact values depend on the specific device variant; consult the datasheet for precise numbers.
- 8-bit HC05-compatible CPU core
- On-chip program memory (ROM) and data memory (RAM)
- Two bidirectional I/O ports with data-direction control
- On-chip timer/counter
- Watchdog timer
- Serial communications interface (SCI) for asynchronous serial I/O
- Vector-based interrupt system with multiple sources
- In-System Programming (ICP) / debugging support
- Low-power operation modes
- Package: plastic DIP (CP suffix indicates plastic package)
- Supply voltage and speed grades vary by device (typical 2.7–5.5 V, up to a few MHz clock)

- Pin count: 20 pins (Plastic DIP package, CP suffix).
- Function: Single-chip 8-bit microcontroller (68HC05 family) with on-chip RAM/ROM, I/O ports, timers, and a serial communications interface (SCI) for embedded control applications.

- Manufacturer: NXP Semiconductors. The MC68HC705SR3CP is part of the MC68HC705 family that originated with Motorola, later Freescale, and is now produced by NXP.
- What kind of company: NXP is a Dutch multinational semiconductor company that designs and manufactures integrated circuits, microcontrollers, and related chips for automotive, industrial, and consumer electronics markets.

MC68HC705SR3CP is an 8-bit, low-cost, low-power microcontroller suitable for simple control tasks. Common application areas include:
- Automotive body electronics (door modules, HVAC, power windows)
- Consumer and home appliances (microwaves, washers/dryers, thermostats, remotes)
- Industrial automation and instrumentation (sensors, alarms, small control loops)
- Office equipment and vending machines (printers, readers, controllers)
- Toys and portable devices (embedded controllers with simple UIs)
Ideal for cost-sensitive, space-constrained applications needing basic I/O and peripherals.

The MC68HC705SR3CP uses a ceramic DIP package (28-pin DIP).