NXP Semiconductors MC9S08SH4MTJR

Overview

MC9S08SH4MTJR from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 4 KB flash, 512 B RAM, 12-channel 10-bit ADC, internal 40 MHz ICS clock source, and integrated temperature sensor - designed for low-pin-count, 5V industrial and consumer applications including fire alarms, personal care devices, and wireless sensor nodes.

For engineers reviewing the MC9S08SH4MTJR datasheet, MC9S08SH4MTJR pinout, MC9S08SH4MTJR application, or MC9S08SH4MTJR equivalent, key selection considerations include its 16-pin TSSOP package, -40°C to +125°C operating range, ganged I/O capability on PTB/PTC, COP watchdog with independent 1 kHz clock, and in-application reprogrammable flash supporting 100,000 write/erase cycles.

Technical Context

The MC9S08SH4MTJR implements the HCS08 CPU core with 20 MHz bus frequency (40 MHz core), backward object-code compatibility with 68HC08/68HC05, and support for up to 32 interrupt/reset sources. Its internal clock source (ICS) integrates a frequency-locked loop (FLL) with precision-trimmable internal reference (±0.5% to –1% deviation over voltage/temperature).

It features three timer modules: two 16-bit TPMs with input capture, output compare, and PWM modes; one 8-bit modulo timer with prescaler; and a real-time counter (RTC) driven by a 1 kHz low-power oscillator. Analog subsystem includes a 12-channel 10-bit ADC with asynchronous clocking, hardware trigger via RTI, and automatic compare function.

Key Specifications

Pinout & Package

MC9S08SH4MTJR is packaged in a 20-pin TSSOP (JEDEC MO-153, 4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin functions are validated per Freescale document MC9S08SH84FS REV 1 and MC9S08SH4CTJ/MC9S08SH4MTJ datasheet revisions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4MTJR, MC9S08SH8MTJR offers double flash capacity with zero layout change, while S9KEAZN32MTJR delivers ARM-class compute and connectivity at the cost of increased design complexity and active power - making MC9S08SH4MTJR optimal for cost- and power-constrained 5V legacy-compatible designs.

Availability

MC9S08SH4MTJR is available at Aetrix Electronics and suitable for fire alarm systems, personal care devices, wireless sensor nodes, and secure boot coprocessor modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MC9S08SH4MTJR 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, with roots in Freescale's microcontroller heritage.

The MC9S08SH4MTJR belongs to the HCS08 SH-family - engineered for cost-sensitive, low-pin-count 5V embedded control in harsh environments, emphasizing robustness, integrated analog, and field-programmable flash in compact packages.

FAQ

What is the maximum operating frequency and bus speed of the MC9S08SH4MTJR?

The MC9S08SH4MTJR features an HCS08 CPU core running up to 40 MHz, with a corresponding 20 MHz bus frequency. This delivers a 50 ns minimum instruction execution time. The internal clock source (ICS) uses a frequency-locked loop (FLL) to generate the core clock from a trimmable internal reference, enabling stable operation across the full –40°C to +125°C range without external crystals when configured for internal mode.

Does the MC9S08SH4MTJR support in-system programming via a single 5V supply?

Yes, the MC9S08SH4MTJR supports in-application flash reprogramming using only the main VDD supply (2.7–5.5 V). No auxiliary voltage rail or dedicated programming pin is required. Its embedded flash allows byte-level writes as fast as 20 µs per byte, with endurance rated at 100,000 write/erase cycles and data retention exceeding 100 years at typical conditions - making it ideal for field-upgradable consumer and industrial devices.

How does the ganged I/O feature work on the MC9S08SH4MTJR, and what is its design benefit?

The MC9S08SH4MTJR supports ganged output control on PTB[5:2] and PTC[3:0], allowing a single write to PORTB or PORTC to toggle multiple pins simultaneously. This enables safe aggregate current drive up to 80 mA without risk of short-circuit due to runaway code. It simplifies firmware for LED arrays, relay drivers, or multi-segment indicators - eliminating bit-banging loops and reducing timing-critical ISR overhead.

Can the MC9S08SH4MTJR operate in ultra-low-power modes with autonomous ADC sampling?

Yes, the MC9S08SH4MTJR supports STOP3 mode with current draw as low as 1.2 µA. In this state, the real-time interrupt (RTI) module can autonomously trigger the 12-channel 10-bit ADC using its asynchronous clock source. Combined with the ADC's auto-compare function, the MCU remains asleep until a measured value crosses a programmed threshold - then wakes only to process the event, maximizing battery life in sensor applications.

What debugging interface does the MC9S08SH4MTJR provide, and is external hardware required?

The MC9S08SH4MTJR integrates a background debug (DBG) module accessible via a single-wire interface, enabling full in-circuit emulation (ICE), flash programming, and real-time bus capture without external JTAG emulators. A standard USB-BDM cable (e.g., DEMO9S08SH8 board) suffices for development - eliminating costly debug probes and reducing engineering setup time for production programming and validation.