NXP Semiconductors MC9S08SH16MTL

Overview

MC9S08SH16MTL from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 KB flash, 1 KB RAM, and a 40-MHz CPU core. It integrates ADC, ACMP, SCI, SPI, I²C, TPM, RTC, and low-power stop3 mode. Used in industrial sensor nodes and battery-powered control modules requiring deterministic real-time response.

For engineers reviewing the MC9S08SH16MTL datasheet, MC9S08SH16MTL pinout, MC9S08SH16MTL application, or MC9S08SH16MTL equivalent, key selection criteria include flash size, stop3-mode current consumption (1.5 µA), 10-bit ADC conversion time (2.5 µs), ICS clock accuracy (±2% over voltage/temperature), and TSSOP-28 package compatibility.

Technical Context

The MC9S08SH16MTL implements the HCS08 CPUV3 core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its Internal Clock Source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference for ±2% bus frequency accuracy across voltage and temperature.

Peripherals operate in Stop3 mode: ADC, ACMP, RTC, and SCI retain functionality with wake-up capability. The single-wire background debug interface enables in-circuit debugging with one hardware breakpoint and on-chip ICE module featuring eight-deep FIFO and nine trigger modes.

Key Specifications

Pinout & Package

MC9S08SH16MTL is packaged in a 28-pin Thin Shrink Small Outline Package (TSSOP) with 0.65 mm pitch, JEDEC MO-153 compliant, and thermal pad optional. Pin functions are validated per Freescale MC9S08SH32 Series Data Sheet Rev. 3 (covers MC9S08SH16).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH16MTL, MC9S08SH32MTL offers identical functionality with doubled flash for larger firmware, while S9KEAZ128AMLH provides ARM-based scalability at the cost of architectural discontinuity and toolchain migration effort.

Availability

MC9S08SH16MTL is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat control, and programmable logic controller (PLC) I/O modules requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SH16MTL 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 Philips' semiconductor division and later the acquisition of Freescale Semiconductor in 2015.

The HCS08 family, including MC9S08SH16MTL, was designed for cost-sensitive, low-power embedded control applications in industrial automation, building controls, and appliance systems where deterministic real-time response and minimal external components are essential.

FAQ

What is the maximum bus frequency supported by the MC9S08SH16MTL?

The MC9S08SH16MTL supports a maximum bus frequency of 20 MHz when using the Internal Clock Source (ICS) with its frequency-locked loop (FLL). This is achieved with appropriate configuration of the ICS trim and divider registers. The HCS08 CPU core operates at this bus frequency, delivering up to 40 million instructions per second. The MC9S08SH16MTL does not support external clock sources above 20 MHz for bus operation.

Does the MC9S08SH16MTL include a temperature sensor?

Yes, the MC9S08SH16MTL includes an on-die temperature sensor connected as a dedicated channel to its 10-bit ADC. This sensor is documented in Section 9.1.5 of the MC9S08SH32 Series Data Sheet, which explicitly covers the MC9S08SH16. It enables direct ambient temperature measurement without external components, with calibration data stored in flash memory for improved accuracy across temperature ranges.

What debug interface does the MC9S08SH16MTL use?

The MC9S08SH16MTL uses a single-wire background debug (BKGD) interface compliant with the HCS08 standard. This interface operates through the BKGD/MS pin and supports in-circuit debugging, including breakpoint setting, memory inspection, and register access. The on-chip debug module includes two additional hardware breakpoints and an eight-deep FIFO for trace data, all accessible via standard Freescale/NXP BDM tools and compatible third-party debuggers.

Is the MC9S08SH16MTL pin-compatible with the MC9S08SH32MTL?

Yes, the MC9S08SH16MTL is pin-compatible with the MC9S08SH32MTL in the same package variant (e.g., TSSOP-28). Both share identical pin assignments, electrical characteristics, and register-level peripheral interfaces. This allows direct substitution in existing designs where increased flash capacity is required, with no PCB or schematic changes necessary - only firmware recompilation and flash programming adjustment.

What low-power modes are available on the MC9S08SH16MTL?

The MC9S08SH16MTL supports three primary low-power modes: Wait mode, Stop2 mode, and Stop3 mode. Stop3 is the deepest, drawing only 1.5 µA while retaining operation of the RTC, ADC, ACMP, and SCI - enabling wake-up on analog threshold crossing or serial activity. All modes preserve RAM contents and support fast wake-up latency, making them suitable for battery-operated and energy-harvesting applications.