NXP Semiconductors MC9RS08KB12CTG

Overview

MC9RS08KB12CTG from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller in a 24-pin QFN package, featuring 12 KB flash, 254-byte RAM, 10-bit ADC with 12 channels, and integrated peripherals including TPM, IIC, SCI, ACMP, and RTI. It operates from 1.8 V to 5.5 V at up to 20 MHz CPU frequency across –40 °C to 85 °C, targeting low-power embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC9RS08KB12CTG datasheet, MC9RS08KB12CTG pinout, MC9RS08KB12CTG application, or MC9RS08KB12CTG equivalent, key selection considerations include its 24-pin QFN thermal resistance (θJA = 113 °C/W), copper-wire QFN package migration (98ASA00602D), single-wire BDC debug interface, and support for wake-up from Stop mode via ADC, ACMP, or KBI - critical for battery-powered edge nodes.

Technical Context

The MC9RS08KB12CTG implements a subset of the HC08 instruction set with BGND support and a single global interrupt vector, enabling deterministic real-time response in resource-constrained systems. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference (0.2% resolution, ±2% deviation over voltage/temperature), supporting bus frequencies up to 10 MHz without external crystal.

System protection includes COP reset with dedicated 1 kHz LPO, low-voltage detection with configurable reset/interrupt, illegal opcode/address detection, and flash-block protection. Power management supports Wait mode (clocks active, full regulation) and Stop mode (clocks halted, regulator in standby), with wakeup sources including RTI, KBI, ADC, ACMP, SCI, and LVD - all verified for operation at 1.8 V minimum supply.

Key Specifications

Pinout & Package

MC9RS08KB12CTG is housed in a 24-pin QFN package (case 98ASA00602D) with 4×4 mm body, 0.5 mm pitch, and exposed thermal pad. The package uses copper wire bonding per Freescale QFN migration addendum (Rev. 0, 07/2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CTG, the MC9RS08KB12CTG delivers 6× more flash and full analog/peripheral integration; versus MC9S08AC128CFGE, it offers 30% lower active current and 1.8 V operation but trades off code density and memory scalability - making it optimal for cost-sensitive, battery-aware embedded nodes.

Availability

MC9RS08KB12CTG is available at Aetrix Electronics and suitable for smart appliance control, industrial sensor nodes, LED lighting drivers, and home automation hubs requiring stable component supply across extended production lifecycles.

Supply support for MC9RS08KB12CTG 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9RS08KB12CTG belongs to NXP's RS08 family - designed specifically for ultra-low-cost, low-power 8-bit embedded control where code density, debug simplicity, and supply voltage flexibility outweigh raw performance needs.

FAQ

What is the maximum operating frequency of the MC9RS08KB12CTG CPU core?

The MC9RS08KB12CTG CPU core operates at up to 20 MHz across the full temperature range (–40 °C to 85 °C) and supply voltage range (1.8 V to 5.5 V). This frequency is achievable using either the internal clock source (ICS) with FLL or an external crystal/resonator via the XOSC module, as confirmed in the Rev. 5 datasheet Section 1.

Does the MC9RS08KB12CTG support debugging during runtime without halting execution?

No, the MC9RS08KB12CTG uses a single-wire background debug (BDC) interface that requires CPU halt for register inspection and memory access. It supports one hardware breakpoint during in-circuit debugging but does not provide real-time trace or non-intrusive monitoring capabilities - consistent with its RS08 architecture design for cost-sensitive applications.

Can the MC9RS08KB12CTG operate reliably at 1.8 V supply voltage in Stop mode?

Yes, the MC9RS08KB12CTG guarantees Stop mode operation down to 1.8 V, with typical supply current of 0.39–4.21 μA across –40 °C to 85 °C. Its internal voltage regulator remains functional at this minimum voltage, enabling wake-up via RTI, KBI, ADC, or ACMP - a key specification validated in Table 8 of the Rev. 5 datasheet.

What package variant does the 'CTG' suffix indicate for the MC9RS08KB12CTG?

The 'CTG' suffix denotes the 24-pin QFN package with copper wire bonding (case number 98ASA00602D), as documented in Freescale's QFN Addendum Rev. 0 (07/2014). This replaces the earlier gold-wire version (98ASA00087D) and is mechanically identical but optimized for improved wire bond reliability and thermal performance.

Is the internal temperature sensor in the MC9RS08KB12CTG calibrated at production?

The MC9RS08KB12CTG includes an uncalibrated 1.7 mV/°C analog temperature sensor feeding the ADC, as stated in the Rev. 5 datasheet Section 1. It provides relative thermal trends but requires system-level calibration against a reference sensor for absolute accuracy - no factory calibration or trim values are stored in the device.