NXP Semiconductors PC9RS08KA2DWE

Overview

PC9RS08KA2DWE 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 source (ICS), an analog comparator with rail-to-rail operation and internal bandgap reference, and keyboard interrupt (KBI) support for three input pins. It targets ultra-low-cost, space-constrained embedded control applications such as appliance sub-systems and sensor interface modules.

For engineers reviewing the PC9RS08KA2DWE datasheet, PC9RS08KA2DWE pinout, PC9RS08KA2DWE application, or PC9RS08KA2DWE equivalent, this page delivers verified technical context including ICS trim resolution (0.2%), ACMP stop-mode operation, KBI port count (3), DFN mechanical outline (98ASA00735D), and Flash endurance (10k erase/write cycles) - all confirmed from Freescale's Rev. 4 datasheet and QFN addendum.

Technical Context

The PC9RS08KA2DWE implements the RS08 CPU core with simplified S08 instruction set extensions including tiny addressing mode (0–$000F) and short addressing mode (0–$001F), enabling single-byte instructions for fastest memory access. Its ICS supports FEI, FBI, and FBILP operational modes with factory-trimmed 20-MHz oscillator and ±2% deviation over voltage/temperature.

Peripherals include an 8-bit modulo timer (MTIM), analog comparator (ACMP) with selectable internal bandgap reference and full rail-to-rail supply operation, and keyboard interrupt (KBI) with edge/level sensitivity on three dedicated pins. All peripherals remain functional in Wait mode and ACMP operates in Stop mode.

Key Specifications

Pinout & Package

PC9RS08KA2DWE uses a 6-pin dual flat no-lead (DFN) package per mechanical drawing 98ASA00735D, with exposed thermal pad connected to VSS. Pin assignments are validated per MC9RS08KA2 Series Data Sheet Rev. 4, Chapter 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA1DWE, PC9RS08KA2DWE doubles Flash capacity for feature-rich firmware; versus MC9S08QG4CDTE, it trades RAM and interface breadth for lower pin count, lower power, and integrated comparator wake functionality - making it optimal for ultra-compact, event-driven control.

Availability

PC9RS08KA2DWE is available at Aetrix Electronics and suitable for appliance control panels, smart sensor nodes, industrial timer modules, and LED lighting drivers requiring stable component supply and long-term lifecycle support.

Supply support for PC9RS08KA2DWE 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 robust design-for-manufacturing practices.

The RS08 family, including PC9RS08KA2DWE, was engineered for ultra-low-cost, ultra-low-power 8-bit control in space-constrained applications where minimal pin count, integrated analog functions, and debug simplicity are essential.

FAQ

What is the maximum operating frequency of the PC9RS08KA2DWE internal clock source?

The PC9RS08KA2DWE features a trimmable internal clock source (ICS) rated for up to 20 MHz. However, its maximum bus frequency is limited to 10 MHz per the datasheet, and actual sustained operation depends on supply voltage and temperature. The ICS supports multiple modes (FEI, FBI, FBILP), with FEI mode delivering the highest usable bus speed under nominal conditions. PC9RS08KA2DWE maintains timing compliance across its specified 1.8–3.6 V and –40°C to +105°C range.

Does the PC9RS08KA2DWE support in-circuit debugging, and what interface does it use?

Yes, the PC9RS08KA2DWE supports in-circuit debugging via a single-wire background debug (BKGD) interface routed through the PTA3 pin. This eliminates the need for multi-pin debug headers and reduces PCB complexity. The BKGD interface enables breakpoint setting, memory inspection, and real-time execution control directly in the target system. PC9RS08KA2DWE implements the RS08 Background Debug Controller (BDC) compliant with Freescale's standard protocol, requiring only a compatible debugger such as the OSBDM or USB-based Cyclone units.

How many keyboard interrupt (KBI) inputs does the PC9RS08KA2DWE provide, and how are they assigned?

The PC9RS08KA2DWE provides three keyboard interrupt (KBI) inputs: PTA0/KBI0, PTA1/KBI1, and PTA2/KBIP2. These are physically implemented on pins 1, 2, and 5 of the 6-pin DFN package. Each can be individually enabled/disabled and configured for edge- or level-sensitive triggering via the KBIPE and KBIES registers. PC9RS08KA2DWE's KBI module supports wake-from-Stop functionality on any enabled input, making it ideal for low-power human-interface applications.

Can the analog comparator (ACMP) in the PC9RS08KA2DWE operate while the MCU is in Stop mode?

Yes, the analog comparator (ACMP) in the PC9RS08KA2DWE remains fully operational in Stop mode, allowing continuous voltage monitoring without CPU activity. It supports comparison against either an external signal or the internal 1.22 V bandgap reference, and can generate interrupts or wake the MCU upon threshold crossing. This capability is explicitly documented in Section 10.1.2.2 of the MC9RS08KA2 Series Data Sheet Rev. 4. PC9RS08KA2DWE leverages this feature for battery monitoring and sensor wake triggers in energy-sensitive designs.

What is the Flash memory endurance specification for the PC9RS08KA2DWE?

The PC9RS08KA2DWE incorporates SuperFlash® technology licensed from SST, specifying a minimum endurance of 10,000 erase/write cycles for its 2048-byte on-chip Flash memory. This rating is guaranteed across the full industrial temperature range and applies to both mass erase and sector-level operations. The Flash also supports secure protection via the FOPT register. PC9RS08KA2DWE's Flash architecture enables in-application programming and field firmware updates without external high-voltage sources.