NXP Semiconductors MC9S08SH8CPJ

Overview

MC9S08SH8CPJ from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB on-chip FLASH memory, and 512 B RAM. It integrates ADC (12-channel, 10-bit), dual TPM modules, SCI, SPI, I²C, RTC, and analog comparator - all operating in Stop3 mode. Designed for cost-sensitive industrial control and sensor interface applications requiring low-power operation and single-wire debug.

For engineers reviewing the MC9S08SH8CPJ datasheet, MC9S08SH8CPJ pinout, MC9S08SH8CPJ application, or MC9S08SH8CPJ equivalent, key selection criteria include its 24-QFN package with exposed pad, internal clock source (ICS) supporting 2–20 MHz bus frequencies, real-time interrupt capability in stop modes, and background debug interface compatibility with standard Freescale BDM tools.

Technical Context

The MC9S08SH8CPJ implements the HCS08 CPU core with HC08 instruction set extension including BGND, supporting up to 32 interrupt/reset sources. Its Internal Clock Source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference (±0.2% resolution, ±2% deviation over voltage/temperature), enabling stable bus frequencies from 2 MHz to 20 MHz without external crystal.

Peripherals are architected for ultra-low-power operation: ADC and ACMP remain functional in Stop3 mode; RTC runs continuously on a free-running 1-kHz internal oscillator; COP watchdog can be clocked independently from bus clock or dedicated 1-kHz source. All I/O pins support configurable pull-up, slew rate, and drive strength.

Key Specifications

Pinout & Package

MC9S08SH8CPJ is housed in a 24-pin QFN package (case outline 98ASA00474D), 4 mm × 4 mm body, 0.5 mm pitch, with exposed thermal pad for enhanced thermal performance. Pin assignments conform to Freescale's MC9S08SH8 Rev. 3 datasheet, Section 2.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8CPJ, MC9S08AC16CPJ offers double FLASH and RAM but omits RTC - making it better for larger firmware without timekeeping needs; S9KEAZ128AMLH provides ARM architecture scalability and modern peripherals but demands firmware rearchitecture and is not pin- or code-compatible.

Availability

MC9S08SH8CPJ is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat controllers, motorized actuator systems, and programmable power monitors requiring stable component supply and long-lifecycle support.

Supply support for MC9S08SH8CPJ 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 since 2015) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SH8 belongs to the HCS08 microcontroller family, engineered for cost-effective, low-power 8-bit control in resource-constrained embedded systems - emphasizing integration, debug accessibility, and robustness across extended temperature ranges.

FAQ

What is the maximum bus frequency supported by the MC9S08SH8CPJ?

The MC9S08SH8CPJ supports a maximum bus frequency of 20 MHz when using the Internal Clock Source (ICS) with Frequency-Locked Loop (FLL). This is achieved with proper trimming and external reference configuration. At 5 V supply and 25°C, the device can sustain 20 MHz operation; derating applies at temperature extremes per Electrical Characteristics table in Appendix A of the Rev. 3 datasheet. The HCS08 CPU core itself operates at up to 40 MHz, with bus clock derived as a division of core clock.

Does the MC9S08SH8CPJ support in-circuit debugging, and what interface is used?

Yes, the MC9S08SH8CPJ supports full in-circuit debugging via a single-wire background debug (BDM) interface on the BKGD/MS pin. It includes on-chip debug capabilities such as breakpoint setting (one user breakpoint plus two additional in the ICE module), trace capture using an eight-deep FIFO, and force-triggered breakpoints. Debugging requires a Freescale-compatible BDM pod (e.g., DEMO9S08SH8 evaluation board with BDM interface) and CodeWarrior Development Studio v6.3 or later.

Can the MC9S08SH8CPJ operate in low-power modes while retaining ADC functionality?

Yes, the MC9S08SH8CPJ retains full ADC functionality in Stop3 mode - the deepest low-power state. In Stop3, the ADC can perform conversions triggered by internal or external events, using the on-chip 1-kHz oscillator or asynchronous clock sources. This enables ultra-low-power sensor polling without waking the CPU, reducing average system current to sub-µA levels while maintaining measurement capability - confirmed in Section 3.6.1 and Chapter 9 of the MC9S08SH8 Rev. 3 datasheet.

What package type and thermal characteristics does the MC9S08SH8CPJ use?

The MC9S08SH8CPJ uses a 24-pin QFN package (case outline 98ASA00474D), measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. It employs copper wire bonding per Freescale's QFN migration addendum (Rev. 0, 07/2014). Thermal resistance θ_JA is 45°C/W typical on a 2-layer JEDEC-standard board; the exposed pad must be soldered to a PCB thermal plane for optimal junction temperature control - detailed in EB806 application note on QFN exposed pad connections.

Is the MC9S08SH8CPJ pin-compatible with other members of the MC9S08SHx family?

Yes, the MC9S08SH8CPJ shares identical pinout and package (24-QFN) with MC9S08SH4CPJ and MC9S08SH16CPJ - all members of the SHx family in the same package variant. Differences lie solely in FLASH size (4 KB, 8 KB, 16 KB) and RAM allocation; peripheral sets, register maps, and electrical characteristics are functionally identical. Firmware compiled for MC9S08SH8CPJ will run unmodified on MC9S08SH4CPJ or MC9S08SH16CPJ, subject to memory layout constraints.