NXP Semiconductors MC9S08GW32CLKR

Overview

MC9S08GW32CLKR from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller designed for low-power LCD-based embedded systems. It features 32 KB flash, 2 KB RAM, dual 16-bit ADCs with 7 single-ended/1 differential channel each, 57 GPIOs, and integrated IRTC with tamper detection. It operates from 1.8 V to 3.6 V across –40 °C to +85 °C and supports stop3 mode wakeup in 6 µs - ideal for battery-powered smart meters and industrial HMI panels.

For engineers reviewing the MC9S08GW32CLKR datasheet, MC9S08GW32CLKR pinout, MC9S08GW32CLKR application, or MC9S08GW32CLKR equivalent, key selection criteria include its 80-pin LQFP package, LCD driver supporting up to 8×24 segments, dual ADC capability with temperature sensor and internal bandgap reference, and compatibility with Freescale's S08 background debug interface.

Technical Context

The MC9S08GW32CLKR implements the enhanced HCS08 CPU core with BGND instruction support and up to 20 MHz operation at 3.6 V–2.15 V, or 10 MHz down to 1.8 V. Its Internal Clock Source (ICS) integrates a frequency-locked loop (FLL) with ±0.2% trimming resolution and ±2% deviation over voltage/temperature, enabling stable 1–20 MHz bus frequencies.

Peripherals include four SCI modules (with LIN support), three SPI interfaces, one I²C bus, two-channel FlexTimer (FTM), programmable delay block (PDB) for ADC scheduling, and three rail-to-rail analog comparators (PRACMP) that remain functional in stop3 mode. The independent real-time clock (IRTC) resides in a separate power domain with 32 bytes of dedicated RAM and hardware calendar compensation.

Key Specifications

Pinout & Package

MC9S08GW32CLKR is housed in an 80-pin LQFP (Case 917A, 14 × 14 mm) with exposed thermal pad. All pins support configurable pull-up/pull-down resistors (17.5–52.5 kΩ), hysteresis, and slew-rate control. PTA6 is output-only when configured as GPIO; PTA5 and PTB1 support ±50 mA instantaneous current; all other I/O pins rated for ±25 mA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08GW64CLKR, the MC9S08GW32CLKR offers identical peripherals and packaging but half the flash and RAM - making it optimal for cost-sensitive, memory-constrained designs. Against S9KEAZN32ACLH, it delivers integrated LCD/IRTC functionality at lower power and simpler software stack, though with less computational headroom.

Availability

MC9S08GW32CLKR is available at Aetrix Electronics and suitable for smart metering, industrial HMI, portable medical devices, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MC9S08GW32CLKR 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications. Formerly Freescale Semiconductor, NXP acquired the HCS08 portfolio in 2015.

The MC9S08GW32CLKR belongs to the GW-series HCS08 microcontrollers, engineered specifically for ultra-low-power, LCD-driven embedded systems in utility metering and human-machine interface applications - emphasizing integrated analog peripherals, robust real-time clocking, and minimal external component count.

FAQ

What is the maximum operating frequency of the MC9S08GW32CLKR?

The MC9S08GW32CLKR supports up to 20 MHz CPU operation at supply voltages from 3.6 V down to 2.15 V, and up to 10 MHz at 1.8 V - fully specified across the industrial temperature range of –40 °C to +85 °C. This frequency scaling is managed by the Internal Clock Source (ICS) module with FLL and optional external crystal inputs (XOSC1/XOSC2).

Does the MC9S08GW32CLKR support in-circuit debugging?

Yes, the MC9S08GW32CLKR includes a single-wire background debug interface accessible via the BKGD/MS pin (PTA6). It supports breakpoint setting during runtime, a dedicated breakpoint unit with three comparators, and full address/data matching - enabling comprehensive firmware validation without requiring JTAG headers or additional debug hardware.

Can the MC9S08GW32CLKR drive an LCD without external components?

Yes, the MC9S08GW32CLKR integrates a full LCD controller supporting up to 8×24 or 4×28 segments with an internal charge pump and programmable VREFO output. Contrast can be trimmed via software-controlled DAC, eliminating the need for external bias generators or resistor networks in most monochrome segment LCD implementations.

What low-power modes does the MC9S08GW32CLKR support, and which peripherals remain active?

The MC9S08GW32CLKR supports Stop2, Stop3, and reduced-power Wait modes. In Stop3 mode - the deepest sleep state - the IRTC, PRACMP comparators, PCNT position counter, and PDB remain fully operational while consuming sub-µA current. Wake-up occurs in 6 µs via IRQ, RTC alarm, or comparator event, preserving system responsiveness.

Is the MC9S08GW32CLKR pin-compatible with other devices in the GW-series?

Yes, the MC9S08GW32CLKR shares identical 80-pin LQFP pinout and register mapping with the MC9S08GW64CLKR. Both devices use the same Case 917A mechanical outline and electrical characteristics, allowing direct substitution in hardware designs where flash/RAM requirements permit - no PCB or firmware changes are needed beyond linker script adjustments.