NXP Semiconductors S9S08SG8E2CTJR

Overview

S9S08SG8E2CTJR from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 B RAM, and integrated ADC, ACMP, SCI, SPI, I²C, TPM, RTC, and background debug interface. It operates at up to 40 MHz CPU frequency, supports -40°C to 125°C temperature range, and features two low-power stop modes - designed for automotive body electronics, industrial sensors, and smart actuators requiring deterministic real-time control.

For engineers reviewing the S9S08SG8E2CTJR datasheet, S9S08SG8E2CTJR pinout, S9S08SG8E2CTJR application, or S9S08SG8E2CTJR equivalent, key selection criteria include its 16-TSSOP package, 16 GPIOs with configurable slew rate and pull-ups, 10-bit 12-channel ADC with temperature sensor, internal clock source (ICS) with ±1.5% FLL accuracy over temperature, and single-wire background debug support for in-circuit development.

Technical Context

The S9S08SG8E2CTJR implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources and a 3-stage pipeline for deterministic execution. Its memory subsystem includes 8 KB on-chip flash with block protection and 512 B RAM, both accessible across full voltage (2.7–5.5 V) and temperature (-40°C to 125°C) ranges.

Peripherals are tightly coupled to low-power operation: the ADC and ACMP remain functional in Stop3 mode; RTC runs continuously using a 1 kHz on-chip oscillator; and the ICS module provides bus frequencies from 2 MHz to 20 MHz via FLL locked to internal or external reference - enabling precise timing without external crystals in cost-sensitive designs.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (JEDEC MO-153, 4.4 mm × 5.0 mm), lead-free and RoHS-compliant. Pinout validated per MC9S08SG8 Rev. 8 datasheet Section 2.1 and Appendix B mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9S08SG8E2CTJR, the SG4 variant trades memory for cost reduction in minimal-feature deployments, while the SG16 variant extends scalability without changing PCB layout or driver software - making both viable alternatives depending on firmware scope and lifecycle roadmap.

Availability

S9S08SG8E2CTJR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart actuator modules requiring stable component supply, long-term manufacturability, and AEC-Q100-aligned reliability.

Supply support for S9S08SG8E2CTJR 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 S9S08SG8E2CTJR belongs to the HCS08 family - engineered for cost-sensitive, real-time embedded control in harsh environments where low power, robust peripherals, and debug accessibility outweigh raw performance.

FAQ

What is the maximum operating frequency of the S9S08SG8E2CTJR CPU core?

The S9S08SG8E2CTJR features an HCS08 CPU core rated for up to 40 MHz operation at temperatures ≤125°C. At higher ambient temperatures (>125°C), the maximum supported frequency is reduced to 36 MHz to maintain timing integrity and thermal safety - as specified in the Rev. 8 datasheet Section 1.1 and Table A-1.

Does the S9S08SG8E2CTJR support in-circuit debugging, and what interface is used?

Yes, the S9S08SG8E2CTJR supports in-circuit debugging via a single-wire background debug (BDM) interface on the BKGD/MS pin (PTA1). This interface enables breakpoint setting, memory inspection, register access, and flash programming without halting real-time peripheral operation - confirmed in Section 17 of the MC9S08SG8 Rev. 8 datasheet.

Can the S9S08SG8E2CTJR operate in low-power modes while retaining analog functionality?

Yes, the S9S08SG8E2CTJR maintains full ADC and ACMP operation in Stop3 mode, including automatic compare and temperature sensor readings. The RTC also continues running using its internal 1 kHz oscillator - allowing wake-up on analog threshold crossing or timed intervals without external components, as documented in Sections 3.6.1 and 9.4.7 of the datasheet.

What clock sources are available for the S9S08SG8E2CTJR, and how accurate is the internal option?

The S9S08SG8E2CTJR offers two primary clock sources: an external crystal/resonator (XOSC) and the internal clock source (ICS) with frequency-locked loop (FLL). The ICS achieves ±1.5% frequency deviation over -40°C to 125°C when trimmed, supporting bus frequencies from 2 MHz to 20 MHz - eliminating need for external timing components in many applications per Section 10.1.

Is the S9S08SG8E2CTJR pin-compatible with other members of the SG8 family?

Yes, the S9S08SG8E2CTJR in 16-TSSOP packaging is pin-compatible with S9S08SG4E2CTJR and S9S08SG16E2CTJR - sharing identical pin assignments, electrical characteristics, and peripheral mappings. This enables memory-scalable design reuse across product tiers without PCB redesign, as verified in MC9S08SG8 Rev. 8 Appendix B and Section 1.1.