NXP Semiconductors MC9RS08KA2CSCR

Overview

MC9RS08KA2CSCR from Freescale Semiconductor is an 8-bit RS08 microcontroller in a 6-pin DFN package, featuring 2 KB Flash, 63 bytes RAM, a trimmable 20-MHz internal clock (ICS), analog comparator with rail-to-rail operation, and keyboard interrupt support for ultra-low-power sensor interface applications.

For engineers reviewing the MC9RS08KA2CSCR datasheet, MC9RS08KA2CSCR pinout, MC9RS08KA2CSCR application, or MC9RS08KA2CSCR equivalent, this device is selected for cost-sensitive, space-constrained embedded control where minimal I/O, sub-1 µA stop-mode current, and integrated analog comparison are required without external crystal or high-speed peripherals.

Technical Context

The MC9RS08KA2CSCR implements the RS08 CPU core with simplified S08 instruction set extensions including tiny and short addressing modes for efficient access to $0000–$000F and $0000–$001F memory ranges respectively. It uses a bus-independent COP watchdog and supports wake-up from stop mode via RTI, KBI, or ACMP events.

Its internal clock source (ICS) delivers up to 10 MHz bus frequency with 0.2% trim resolution and ±2% deviation over voltage/temperature. The analog comparator operates fully in stop mode and can reference either external inputs or an internal bandgap voltage, enabling low-power threshold detection.

Key Specifications

Pinout & Package

MC9RS08KA2CSCR is housed in a 6-pin dual flat no-lead (DFN) package (case outline 98ASA00735D), measuring 2.0 mm × 2.0 mm × 0.55 mm, with exposed thermal pad. Pin numbering follows standard DFN orientation (pin 1 marked by dot or chamfer).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSCR, MC9RS08KA1CSCR offers identical functionality at lower memory capacity, while MC9RS08KB12CFJR provides expanded peripherals and memory but demands layout changes and increased board area.

Availability

MC9RS08KA2CSCR is available at Aetrix Electronics and suitable for smart sensor nodes, industrial control panels, medical wearables, and IoT edge endpoints requiring stable component supply and long-term manufacturability.

Supply support for MC9RS08KA2CSCR 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, specializing in automotive, industrial, and consumer microcontrollers with emphasis on integration, low power, and robust design.

The MC9RS08KA2CSCR belongs to the RS08 family - designed for ultra-low-cost, ultra-low-power 8-bit control in space-constrained applications where minimal I/O, fast wake-up, and analog integration are critical.

FAQ

What is the maximum bus frequency supported by the MC9RS08KA2CSCR?

The MC9RS08KA2CSCR 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 maintained across the full operating voltage (1.8–3.6 V) and temperature range (–40°C to +105°C), with factory trim and user-adjustable calibration ensuring timing stability.

Does the MC9RS08KA2CSCR support in-circuit debugging?

Yes, the MC9RS08KA2CSCR supports single-wire background debug (BDM) via the PTA3/BKGD pin. This enables real-time debugging, flash programming, and breakpoint setting without requiring additional debug headers or JTAG circuitry - essential for rapid development and field firmware updates.

Can the analog comparator in the MC9RS08KA2CSCR operate during stop mode?

Yes, the analog comparator (ACMP) in the MC9RS08KA2CSCR remains fully operational during stop mode and can generate interrupts or wake the MCU upon threshold crossing. It supports both external input comparison and internal bandgap reference selection, enabling autonomous low-power sensing without CPU involvement.

What are the I/O capabilities of the MC9RS08KA2CSCR in its 6-pin DFN package?

The MC9RS08KA2CSCR in the 6-pin DFN package provides two general-purpose I/O pins (PTA0, PTA1), one dedicated KBI input (PTA2), and one multi-function pin (PTA3) usable as ACMPO or BKGD. All I/O pins support configurable internal pullup/pulldown and can serve as keyboard interrupt sources with edge- or level-sensitivity.

Is the MC9RS08KA2CSCR pin-compatible with other RS08 family members?

No, the MC9RS08KA2CSCR is not pin-compatible with other RS08 devices outside its 6-pin DFN variant group. Its pin assignment (e.g., PTA2/KBIP2/TCLK/RESET/VPP and PTA3/ACMPO/BKGD/MS) is specific to this package; migration to 8-pin SOIC or PDIP variants requires PCB layout changes despite shared core functionality.