NXP Semiconductors PC9RS08KA2FPE

Overview

PC9RS08KA2FPE 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 (10-MHz bus), analog comparator with rail-to-rail operation and internal bandgap reference, and keyboard interrupt support for low-pin-count embedded control. It targets space-constrained sensor nodes and simple industrial I/O modules.

For engineers reviewing the PC9RS08KA2FPE datasheet, PC9RS08KA2FPE pinout, PC9RS08KA2FPE application, or PC9RS08KA2FPE equivalent, key selection factors include its 6-pin DFN footprint, single-byte tiny/short addressing modes, ACMP operation in STOP mode, COP watchdog with bus-independent clock, and background debug interface via BKGD pin - all critical for ultra-low-cost, low-power MCU replacement in legacy designs.

Technical Context

The PC9RS08KA2FPE implements the RS08CPUV1 core with simplified S08 instruction set extensions including LDA/STA/CLR in short addressing ($0000–$001F) and ADD/SUB/INC/DEC in tiny addressing ($0000–$000F), enabling single-byte opcodes and reduced cycle count. Its ICS supports FEI/FBI/FBILP modes with factory-trimmed 0.2% resolution and ±2% deviation over voltage/temperature.

Peripherals are tightly integrated: ACMP operates fully in STOP mode with selectable internal bandgap reference; MTIM provides 8-bit modulo timing; KBI supports three interrupt-capable inputs on the 6-pin variant; and BDM enables single-breakpoint in-circuit debugging via BKGD pin without external JTAG hardware.

Key Specifications

Pinout & Package

PC9RS08KA2FPE uses the 6-pin DFN package (mechanical drawing 98ASA00735D), with 2 mm × 2 mm body, 0.5 mm pitch, and exposed thermal pad. Pin assignment is validated per MC9RS08KA2 Series Data Sheet Rev. 4, Section 2.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA1FPE, PC9RS08KA2FPE doubles Flash for feature-rich firmware while retaining identical pinout and power profile; versus S9S08QG8J2CTJR, it trades UART and memory for analog event detection and minimal footprint - making PC9RS08KA2FPE optimal for ultra-compact, sensor-triggered control.

Availability

PC9RS08KA2FPE is available at Aetrix Electronics and suitable for smart sensor nodes, industrial I/O modules, consumer appliance controls, and portable medical diagnostics requiring stable component supply across long-lifecycle production programs.

Supply support for PC9RS08KA2FPE 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 semiconductor company specializing in embedded processing, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The RS08 family was designed for ultra-low-cost, ultra-low-power 8-bit control applications where minimal pin count, small footprint, and integrated analog functions reduce BOM and PCB complexity.

FAQ

What is the maximum operating frequency of the PC9RS08KA2FPE internal clock?

The PC9RS08KA2FPE features an Internal Clock Source (ICS) with a maximum 20-MHz oscillator frequency, supporting up to 10-MHz bus operation. This is factory-trimmed to 0.2% resolution with ±2% deviation across temperature and supply voltage ranges, eliminating need for external crystals in timing-tolerant applications.

Does the PC9RS08KA2FPE support in-circuit debugging, and what interface is used?

Yes, the PC9RS08KA2FPE supports in-circuit debugging via its single-wire Background Debug (BKGD) interface on the PTA3 pin. This allows flash programming, register inspection, and single-breakpoint debugging without external JTAG hardware - essential for rapid prototyping and field firmware updates.

Can the analog comparator in PC9RS08KA2FPE operate while the MCU is in STOP mode?

Yes, the ACMP in PC9RS08KA2FPE remains fully functional in STOP mode, consuming less than 1 µA. It supports comparison against either external inputs or the internal 1.22 V bandgap reference, enabling wake-on-analog-threshold events without CPU intervention - critical for battery-operated sensor wake triggers.

What package type and dimensions does the PC9RS08KA2FPE use?

The PC9RS08KA2FPE uses a 6-pin Dual Flat No-Lead (DFN) package with mechanical drawing number 98ASA00735D: 2.0 mm × 2.0 mm body, 0.5 mm pin pitch, and exposed thermal pad. It replaced the earlier gold-wire version (98ARL10602D) under Freescale's QFN migration program using copper wire bonding.

How much Flash and RAM memory does the PC9RS08KA2FPE provide?

The PC9RS08KA2FPE integrates 2048 bytes of on-chip Flash EEPROM for program storage and 63 bytes of on-chip RAM for data and stack operations. This memory configuration supports compact firmware for real-time control, sensor interfacing, and low-level protocol handling without external memory.