NXP Semiconductors MC9S08SH32CTG

Overview

MC9S08SH32CTG from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 32 KB on-chip FLASH, 2 KB RAM, and a 40-MHz CPU core. It integrates ADC (10-bit, 16-channel), dual TPM PWM modules, SCI/SPI/IIC interfaces, RTC, and analog comparators - designed for cost-sensitive industrial control and sensor interface applications requiring low-power operation and robust debug support.

For engineers reviewing the MC9S08SH32CTG datasheet, MC9S08SH32CTG pinout, MC9S08SH32CTG application, or MC9S08SH32CTG equivalent, key selection criteria include its 28-TSSOP package, stop3-mode operation with ADC/ACMP active, ICS clock trimming accuracy (±0.2% at room temp), and single-wire background debug interface compatibility.

Technical Context

The MC9S08SH32CTG implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources and operating at up to 40 MHz. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference, enabling bus frequencies from 2 MHz to 20 MHz and ±2% deviation over voltage/temperature.

Peripherals include two 2-channel TPM modules supporting input capture, output compare, and edge-/center-aligned PWM; a 10-bit ADC with 2.5 μs conversion time, temperature sensor, and automatic compare; and an analog comparator (ACMP) with interrupt capability and routing to TPM - all functional in stop3 mode for ultra-low-power wake-up sensing.

Key Specifications

Pinout & Package

MC9S08SH32CTG is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP) with 0.65 mm pitch, optimized for compact industrial and automotive control boards. Pin functions are validated per Freescale MC9S08SH32 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 MC9S08SH32CTG, MC9S08SH16CTG offers identical functionality at lower memory cost but limits firmware growth headroom, while S9S08SG32E1MTJ provides improved ruggedness and lifecycle support at the expense of board redesign due to different package and pin assignment.

Availability

MC9S08SH32CTG is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, smart HVAC actuators, and portable medical diagnostics requiring stable component supply across extended production lifecycles.

Supply support for MC9S08SH32CTG 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 company formed from the spin-off of Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9S08SH32CTG belongs to NXP's legacy HCS08 microcontroller product line, engineered for cost-effective, low-power embedded control in applications where deterministic real-time response and debug accessibility outweigh raw processing throughput.

FAQ

What is the maximum operating frequency of the MC9S08SH32CTG CPU core?

The MC9S08SH32CTG features an HCS08 CPU core rated for up to 40 MHz operation. This maximum frequency is achievable when the internal clock source (ICS) is configured to deliver a 20 MHz bus clock with appropriate prescaling, and all timing constraints - including FLASH access wait states and supply voltage stability - are met per the Rev. 3 datasheet specifications.

Does the MC9S08SH32CTG support in-circuit debugging without a dedicated JTAG interface?

Yes, the MC9S08SH32CTG supports single-wire background debug (BDM) via the BKGD/MS pin, eliminating the need for a full JTAG connector. This interface enables breakpoint setting, memory inspection, and register read/write during active operation - all using only one dedicated pin and standard BDM protocol-compliant tools such as the NXP DEMO9S08SH32 evaluation board.

Can the MC9S08SH32CTG ADC operate in low-power stop modes?

Yes, the MC9S08SH32CTG ADC remains fully functional in stop3 mode, allowing analog measurements to trigger wake-up events without exiting low-power state. The ADC supports hardware-triggered conversions, automatic compare, and use of the internal temperature sensor and bandgap reference - all while drawing less than 1 μA total system current in stop3, as verified in Section 9.4.7 of the MC9S08SH32 Rev. 3 datasheet.

What clock sources are available for the MC9S08SH32CTG, and how accurate is the internal reference?

The MC9S08SH32CTG supports three clock sources: external crystal/ceramic resonator (XOSC), internal clock source (ICS) with FLL, and internal 1-kHz low-power oscillator. The ICS internal reference is factory-trimmed to ±0.2% resolution at 25°C, with ±2% deviation over full temperature and voltage range - sufficient for UART baud rate generation and non-critical timing without external crystal.

Is the MC9S08SH32CTG pin-compatible with other members of the SH-series microcontrollers?

The MC9S08SH32CTG in 28-TSSOP package shares identical pinout with MC9S08SH16CTG and MC9S08SH8CTG per Freescale's ordering information (Appendix B). This allows hardware reuse across memory variants - for example, a PCB designed for MC9S08SH32CTG can accept MC9S08SH16CTG without layout changes, provided firmware accommodates reduced FLASH/RAM size.