NXP Semiconductors MC9RS08KA2CSC

Overview

MC9RS08KA2CSC from Freescale Semiconductor is an 8-bit RS08 microcontroller featuring a 20 MHz trimmable internal clock source, 2 KB on-chip Flash EEPROM, 63 bytes RAM, and integrated peripherals including an analog comparator (ACMP), modulo timer (MTIM), and keyboard interrupt (KBI) module. It operates at up to 10 MHz bus frequency and supports Wait/Stop low-power modes with wake-up via RTI, KBI, or ACMP - ideal for ultra-low-cost sensor interface and battery-powered control applications.

For engineers reviewing the MC9RS08KA2CSC datasheet, MC9RS08KA2CSC pinout, MC9RS08KA2CSC application, or MC9RS08KA2CSC equivalent, key selection considerations include its 6-pin DFN package with two GPIOs, single-byte addressing capability for $0000–$001F memory, COP watchdog with bus-independent clock, and ACMP operation in Stop mode with rail-to-rail input range.

Technical Context

The MC9RS08KA2CSC implements the RS08 CPU core with simplified S08 instruction set extensions including LDA/STA/CLR for short addressing ($0000–$001F) and ADD/SUB/INC/DEC for tiny addressing ($0000–$000F), enabling single-cycle access to critical memory regions. Its ICS provides factory-trimmed 20 MHz internal oscillator with 0.2% trim resolution and ±2% deviation over voltage/temperature.

Peripherals are tightly coupled to low-power operation: the ACMP supports comparison to internal bandgap reference and remains functional in Stop mode; the MTIM is an 8-bit modulo timer with programmable prescaler; and the KBI supports edge- or level-sensitive wake-up on up to three inputs in the 6-pin package configuration.

Key Specifications

Pinout & Package

MC9RS08KA2CSC is housed in a 6-pin dual flat no-lead (DFN) package (case outline 98ASA00735D), measuring 2.0 × 2.0 × 0.55 mm, with exposed thermal pad. Pin assignment is validated per MC9RS08KA2 Series Data Sheet Rev. 4 (Section 2.2) and QFN_Addendum Rev. 0 (2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA1CSC, MC9RS08KA2CSC provides double Flash capacity for enhanced firmware robustness; compared with MC9RS08KB12CDT, it offers minimal footprint and lowest BOM cost for fixed-function, ultra-compact applications - making MC9RS08KA2CSC optimal for cost-constrained, space-limited designs with stable feature requirements.

Availability

MC9RS08KA2CSC is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical devices, industrial control panels, and home appliance timers requiring stable component supply across long production lifecycles.

Supply support for MC9RS08KA2CSC 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 microcontrollers, analog, and connectivity ICs for automotive, industrial, and consumer markets.

The MC9RS08KA2CSC belongs to the RS08 family - designed specifically for ultra-low-cost, ultra-low-power 8-bit control applications where minimal pin count, small footprint, and integrated analog functions reduce system complexity.

FAQ

What is the maximum operating frequency of the MC9RS08KA2CSC internal bus?

The MC9RS08KA2CSC supports a maximum internal bus frequency of 10 MHz. This is derived from its trimmable 20 MHz internal clock source (ICS) with a configurable divider. The 10 MHz bus speed enables deterministic timing for real-time I/O control while maintaining low power consumption - a key design target for the RS08 architecture used in MC9RS08KA2CSC.

Does the MC9RS08KA2CSC support in-circuit debugging?

Yes, the MC9RS08KA2CSC includes a single-wire Background Debug (BKGD) interface accessible via the PTA3 pin. It supports breakpoint setting and real-time register inspection during active execution. This capability is integral to the RS08 core design and is fully implemented in MC9RS08KA2CSC, enabling efficient firmware development without additional hardware debug probes.

What power-saving modes does the MC9RS08KA2CSC support, and how do they differ?

The MC9RS08KA2CSC supports Wait and Stop modes. In Wait mode, the CPU halts but peripherals (including ACMP and MTIM) remain clocked; in Stop mode, nearly all clocks are disabled, reducing current to sub-microamp levels. Both modes support wake-up via RTI, KBI, or ACMP - a capability confirmed in the MC9RS08KA2CSC datasheet Section 3.5–3.6 and essential for battery-operated use of MC9RS08KA2CSC.

Can the analog comparator in the MC9RS08KA2CSC operate while the MCU is in Stop mode?

Yes, the ACMP in MC9RS08KA2CSC remains fully functional in Stop mode, including comparison against the internal 1.25 V bandgap reference. This allows continuous analog monitoring with wake-up on threshold crossing - a documented feature in Section 10.1.2.2 of the MC9RS08KA2CSC datasheet, critical for energy-efficient sensor applications.

What is the Flash memory endurance and data retention specification for the MC9RS08KA2CSC?

The MC9RS08KA2CSC Flash memory is rated for 100,000 program/erase cycles and 10 years of data retention at +85°C, per Freescale's MC9RS08KA2 Series Data Sheet Rev. 4 (Appendix A, DC Characteristics). These values apply directly to MC9RS08KA2CSC and are guaranteed under specified operating conditions - supporting reliable field updates and long-term deployment.