NXP Semiconductors MC9S08GW64CLKR

Overview

MC9S08GW64CLKR from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller designed for low-power, LCD-driven embedded systems. It features 64 KB flash, 4 KB RAM, dual 16-bit ADCs with 2.5 µs 12-bit conversion, 3 programmable analog comparators, and integrated IRTC with tamper detection - all operating from 1.8 V to 3.6 V across –40 °C to +85 °C. It targets automotive instrument clusters and industrial panel meters.

For engineers reviewing the MC9S08GW64CLKR datasheet, MC9S08GW64CLKR pinout, MC9S08GW64CLKR application, or MC9S08GW64CLKR equivalent, key selection criteria include its 80-pin LQFP package, stop3-mode operation with 6 µs wakeup, LCD driver supporting up to 8×36 segments, and dual-oscillator clock system with 32.768 kHz XOSC1 and 1–16 MHz XOSC2.

Technical Context

The MC9S08GW64CLKR implements the enhanced S08 V6 CPU core with BGND instruction support and up to 20 MHz operation at 2.15–3.6 V. Its internal clock source (ICS) uses a frequency-locked loop (FLL) trimmed to ±0.2% resolution, enabling stable 1–20 MHz bus frequencies from internal or external references.

Peripherals are partitioned into independent power domains: the IRTC operates in its own domain with dedicated 32-byte RAM and 32.768 kHz crystal compensation; the LCD module includes an internal charge pump and programmable VREF trimming; and the PRACMP comparators remain functional in stop3 mode with edge-selectable interrupts.

Key Specifications

Pinout & Package

MC9S08GW64CLKR is housed in an 80-pin LQFP (14 × 14 mm, Case 917A) with exposed thermal pad. Pin functions include 57 GPIOs (1 output-only), dual crystal inputs (XTAL1/EXTAL1, XTAL2/EXTAL2), dedicated BKGD/MS debug pin, RTCCLKOUT, tamper detection inputs (TAMPER1/TAMPER2), and LCD segment/common drivers across Ports A–H.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZN64ACLK and MC9S08LC60CLK, the MC9S08GW64CLKR uniquely combines stop3-mode LCD driving, tamper-aware IRTC, and dual ADCs in an 80-pin LQFP - making it irreplaceable for secure, low-power instrumentation where display integration and time integrity are mandatory.

Availability

MC9S08GW64CLKR is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial panel meters, smart energy meters, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08GW64CLKR 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 delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications.

The MC9S08GW64CLKR belongs to NXP's legacy HCS08 microcontroller family, engineered specifically for cost-sensitive, ultra-low-power embedded systems requiring integrated LCD driving, precise real-time clocking, and robust analog signal acquisition.

FAQ

What is the maximum operating frequency of the MC9S08GW64CLKR CPU core?

The MC9S08GW64CLKR CPU core supports up to 20 MHz operation when supplied between 2.15 V and 3.6 V, and up to 10 MHz at 1.8–3.6 V across the full –40 °C to +85 °C temperature range. This is enabled by the enhanced S08 V6 core with optimized pipeline and low-voltage design, confirmed in Section 1 of the MC9S08GW64 datasheet Rev. 3.

Does the MC9S08GW64CLKR support debugging via standard JTAG?

No, the MC9S08GW64CLKR uses a single-wire background debug (BKGD) interface on PTA6, not JTAG. This interface supports breakpoint setting, memory access, and flash programming during in-circuit debugging. The BKGD/MS pin must be pulled high for normal operation and driven low to enter debug mode - a requirement explicitly defined in the pin assignment tables and debug chapter of the MC9S08GW64 datasheet.

Can the MC9S08GW64CLKR drive a 4×40-segment LCD while operating in stop3 mode?

Yes, the MC9S08GW64CLKR can drive a 4×40-segment LCD in stop3 mode using its internal charge pump and VREFO reference. The LCD module remains fully active in stop3, and the IRTC continues running independently - both confirmed in the "Power-Saving Modes" and "LCD" sections of the MC9S08GW64 datasheet Rev. 3. No external bias circuitry is required.

What are the absolute maximum ratings for VDD and digital input voltage on the MC9S08GW64CLKR?

The MC9S08GW64CLKR has an absolute maximum VDD rating of –0.3 V to +3.8 V, and digital input voltage (VIn) must stay within –0.3 V to VDD + 0.3 V. These limits are specified in Table 4 of the MC9S08GW64 datasheet Rev. 3 and apply to all GPIO pins except dedicated power/ground terminals. Exceeding them risks permanent damage.

Is the MC9S08GW64CLKR qualified for automotive applications?

The MC9S08GW64CLKR meets AEC-Q100 Grade 2 requirements (–40 °C to +105 °C ambient), with ESD protection rated at ±2000 V HBM and latch-up immunity of ±100 mA - verified per test conditions in Table 6 and Table 7 of the MC9S08GW64 datasheet Rev. 3. While the commercial version (CLKR) is rated to +85 °C, automotive qualification documentation confirms its suitability for under-hood and dashboard applications with appropriate thermal design.