MC68HC705J1ACP

The MC68HC705J1ACP is an 8‑bit microcontroller in the Motorola/Freescale/NXP 68HC05 family. It combines a simple HC05 core with on‑chip memory and peripherals in a compact package for low‑cost embedded control.
Key points:
- Core and memory: 8‑bit HC05 CPU; on‑chip program memory and RAM (sizes vary by device).
- Peripherals: I/O ports, timers, a serial interface (SCI) for asynchronous comms, and a watchdog/reset circuit; some variants include ADC/PWM or other features.
- Programming and use: supports in‑system programming; straightforward interrupt handling for responsive control.
- Package/grade: ACP suffix identifies a specific package/temperature grade (often automotive or plastic package variants).
- Applications: suited for cost‑sensitive embedded control in automotive, consumer, and industrial equipment.
Note: exact memory sizes, peripheral set, voltage range, and timing depend on the specific device variant. Consult the MC68HC705J1ACP datasheet for precise specifications.

Direct equivalents are other MC68HC05J1 family devices with the same memory map; the closest pin-compatible alternative is MC68HC705J1AP (same core, different package). There is no universal cross‑family substitute; for exact cross references by ROM size and packaging, consult the NXP/Freescale device cross-reference database.

Here are the core features of the MC68HC705J1ACP (an HC05-family microcontroller):
- 8-bit HC05 CPU core with Harvard architecture
- On-chip program memory (ROM/OTP) and data memory (RAM)
- Two bidirectional I/O ports with bit-addressable I/O
- Serial Communications Interface (SCI) for asynchronous serial I/O
- Timers (8-bit variety) and a watchdog/COP timer
- Multiple, vectored interrupts with masking
- Clock options: external clock input and/or internal oscillator
- Single-supply operation (typical 4.5–5.5 V)
- Automotive-grade variant (ACP) with extended temperature range
- On-chip peripherals suitable for automotive/applications
- Available in small packages (e.g., 28-pin variants) for compact designs
Note: exact RAM/ROM sizes and peripheral counts vary by exact subvariant; J1ACP denotes automotive-grade packaging and features. For precise specs, consult the official datasheet.

- Pin count: 28 pins (DIP28 package).
- Function: 8-bit microcontroller (MC68HC05 family) with on‑chip memory and peripherals (I/O, timers, serial interface, etc.) for embedded control applications.

- Manufacturer: Freescale Semiconductor (originally Motorola’s semiconductor division; now part of NXP Semiconductors).
- What kind of company: A multinational semiconductor company that designs and manufactures embedded processors, microcontrollers, and other integrated circuits.

MC68HC705J1ACP is an 8‑bit, low‑cost MCU with on‑chip ROM/RAM, A/D, timers, SCI and GPIO; suited for compact, low‑power embedded control tasks. Common application areas:
- Automotive body electronics, instrument clusters, remote‑control modules
- Consumer appliances and home electronics (washers/dryers, HVAC, microwaves, kitchen devices)
- Industrial sensors and small process control, data logging
- Portable/battery‑powered devices and handheld controllers
- Simple medical instrumentation and other compact control tasks

Plastic DIP, 28-pin (PDIP) package.