NXP Semiconductors MC9RS08KA2CPC

Overview

MC9RS08KA2CPC from Freescale Semiconductor is an 8-bit RS08 microcontroller in an 8-pin PDIP package, featuring 2 KB on-chip Flash, 63 bytes RAM, a trimmable 20-MHz internal clock source (ICS), an analog comparator (ACMP), and a modulo timer (MTIM). It supports wait/stop power-saving modes with wake-up via RTI, KBI, or ACMP, and targets low-cost embedded control in space-constrained applications.

For engineers reviewing the MC9RS08KA2CPC datasheet, MC9RS08KA2CPC pinout, MC9RS08KA2CPC application, or MC9RS08KA2CPC equivalent, this page delivers verified technical context, package-specific I/O mapping, real-world use cases, and validated alternative options for cost-sensitive, low-pin-count MCU selection.

Technical Context

The MC9RS08KA2CPC implements the RS08 CPU core with simplified S08 instruction set extensions including tiny and short addressing modes for $0000–$000F and $0000–$001F respectively, enabling single-byte instructions and reduced cycle counts. It integrates an ICS with factory-trimmed 20-MHz oscillator, supporting up to 10-MHz bus operation and 0.2% trim resolution.

Peripherals include an ACMP operating rail-to-rail with internal bandgap reference option and stop-mode capability, a keyboard interrupt (KBI) module with five configurable ports, and an 8-bit modulo timer (MTIM) with programmable clock prescaling. All peripherals are accessible via memory-mapped registers and support active background debug via BKGD pin.

Key Specifications

Pinout & Package

MC9RS08KA2CPC is housed in an 8-pin PDIP (plastic dual in-line package) with 0.3-inch body width and standard through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with legacy prototyping and wave-soldered industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9RS08KA2CPC, MC9RS08KA2CPD offers identical functionality in a smaller footprint but sacrifices I/O flexibility, while MC9S08QG8CDT provides scalable memory and interfaces at the cost of complexity and layout overhead - making MC9RS08KA2CPC optimal for fixed-function, low-pin-count control.

Availability

MC9RS08KA2CPC is available at Aetrix Electronics and suitable for smart home interfaces, industrial sensor nodes, LED lighting sequencers, and appliance control panels requiring stable component supply and long-term manufacturability.

Supply support for MC9RS08KA2CPC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing solutions, delivering high-reliability microcontrollers for automotive, industrial, and consumer applications.

The MC9RS08KA2CPC belongs to the RS08 family - designed specifically for ultra-low-cost, ultra-low-power 8-bit control in space- and budget-constrained systems where simplicity, debug capability, and minimal external components are essential.

FAQ

What is the maximum bus frequency supported by the MC9RS08KA2CPC?

The MC9RS08KA2CPC supports a maximum bus frequency of 10 MHz, derived from its internal clock source (ICS) operating at up to 20 MHz with a 2× divider. This frequency is guaranteed across the full 1.8–3.6 V supply range and –40°C to +105°C temperature range per the Electrical Characteristics table in Rev. 4 datasheet.

Does the MC9RS08KA2CPC support in-circuit debugging, and how is it implemented?

Yes, the MC9RS08KA2CPC supports in-circuit debugging via its single-wire Background Debug (BKGD) interface on pin PTA3. The BKGD pin enables flash programming, real-time register inspection, and single-breakpoint execution without halting the system clock - all using the standard Freescale BDM protocol and compatible debug probes.

Can the analog comparator in the MC9RS08KA2CPC operate during Stop mode?

Yes, the ACMP in the MC9RS08KA2CPC remains fully operational during Stop mode, allowing continuous voltage monitoring with sub-µA quiescent current. It can generate interrupts on threshold crossing and supports comparison against either external inputs or the internal 1.25 V bandgap reference - confirmed in Section 10.1.2.2 of the Rev. 4 datasheet.

How many keyboard interrupt (KBI) inputs does the MC9RS08KA2CPC provide in the 8-pin PDIP package?

The MC9RS08KA2CPC in the 8-pin PDIP package (CPC suffix) provides five KBI inputs: PTA0, PTA1, PTA2, PTA3, and PTA4. This is explicitly stated in the "Package Options" section of the Rev. 4 datasheet and distinguishes it from the 6-pin DFN variant, which supports only three KBI ports.

What Flash memory security features are available on the MC9RS08KA2CPC?

The MC9RS08KA2CPC implements Flash security via the Flash Options Register (FOPT) and Non-Volatile Options Register (NVOPT), allowing users to disable background debug access and prevent read-out of Flash contents. Once secured, unsecured debug access is permanently blocked until a mass erase - a hardware-level protection mechanism documented in Section 4.6.4 of the Rev. 4 datasheet.