MC68HC705B16CFN

MC68HC705B16CFN is an eight‑bit single‑chip microcontroller from Motorola (now NXP) in the 68HC05 family. It uses an HC05‑compatible core for embedded systems and includes on‑chip program memory (ROM/Flash) and RAM, plus standard MCU peripherals such as I/O ports, timers, a serial communications interface (SCI), a watchdog timer, and an interrupt system. It runs from a single supply (typically around 4–5 V) and supports a straightforward development path with assembly or C, using conventional 6805‑style access to program memory. Package options are compact (usually 20–28 pins), making it suitable for low‑pin‑count applications. The B16 suffix denotes a specific variant/ROM size and packaging; exact memory sizes, pinout, clocking, and electrical specs vary by revision. Note that this is a legacy device; modern designs typically use newer MCUs. For precise specifications, consult the official MC68HC705B16CFN datasheet from Motorola/Freescale/NXP.

Direct one-to-one equivalents for MC68HC705B16CFN do not exist. It’s a 68HC05 family device; the closest matches are other 68HC705 B-series parts with the same memory footprint (refer to Freescale/NXP cross-reference tables). If migrating, consider modern HCS08/S08 options, such as MC9S08GB16 (or other MC9S08 devices) depending on RAM/ROM and package requirements.

Here are the key features of the MC68HC705B16CFN (concise overview):
- 8-bit MC68HC05 core (8-bit CPU, A and B accumulators, 16-bit index X)
- On-chip program memory: 16 KB ROM
- On-chip data memory: 512 bytes RAM
- Serial communications interface (SCI) for asynchronous serial I/O
- On-chip timer and a watchdog timer
- Interrupt system with multiple vectored sources
- Direct-page addressing with DP register support and 16-bit index
- On-chip I/O ports for general-purpose I/O
- Clocking: internal oscillator with external clock option
- Low-power/run modes (power-saving operation)
- Simple, single-chip solution with standard peripheral set
- Package: 20-pin plastic DIP or equivalent (CFN suffix)
Note: Exact memory sizes and I/O counts can vary by revision/lot; consult the official datasheet for precise specifications.

- Pin count: 20 pins (packaged in a 20-pin DIP/SOIC, suffix N denotes plastic package).
- Function: 8‑bit microcontroller from the MC68HC05 family with on‑chip memory and peripherals (I/O, timers, and a serial interface) for embedded control applications.

Manufacturer: NXP Semiconductors (the MC68HC705B16CFN originated with Motorola, then Freescale, and is now part of NXP).
What kind of company: NXP is a Dutch multinational technology company that designs and manufactures semiconductors and related electronics components.

MC68HC705B16CFN is a low‑cost, 8‑bit MCU suited for space‑constrained, cost‑sensitive control tasks. Common application areas:
- Automotive body electronics (lighting, door modules, HVAC controls)
- Consumer appliances and electronics (remote controls, washers/dryers, microwaves, air conditioners)
- Industrial instrumentation and small control modules (metering, sensors)
- Portable/embedded devices and medical monitoring equipment
- Security and access control systems (alarm panels, door/gate controllers)
Uses leverage its small package, on‑chip peripherals, and modest memory for simple, embedded control tasks.

A 16-pin plastic DIP (DIP-16) package.