NXP Semiconductors S9S08RN48W1MLF

Overview

S9S08RN48W1MLF from NXP Semiconductors (formerly Freescale) is an 8-bit S08 MCU with 48 KB flash, 4 KB RAM, and 256-byte EEPROM with ECC, operating at up to 20 MHz bus frequency across -40 °C to 125 °C. It integrates ADC (12-bit, 16-channel), three FTM modules, three SCI/UARTs, I²C, SPI, TSI, and ACMP - designed for automotive body control, industrial sensor nodes, and motor drive supervision.

For engineers reviewing the S9S08RN48W1MLF datasheet, S9S08RN48W1MLF pinout, S9S08RN48W1MLF application, or S9S08RN48W1MLF equivalent, this page delivers verified technical context, package mapping to 48-pin LQFP, validated peripheral timing, low-power stop3 mode current (3.8 µA), and two confirmed alternative MCUs with documented functional and packaging differences.

Technical Context

The S9S08RN48W1MLF uses an S08 CPU core with four-level nested interrupt support and up to 40 interrupt/reset sources. Its internal clock system combines a Pierce oscillator (XOSC) and frequency-locked-loop (FLL)-based ICS, enabling ±2.0% DCO output deviation over -40 °C to 125 °C with 39.0625 kHz internal reference trimming.

Peripherals include three flex timer modules (FTM) - one 6-channel and two 2-channel - supporting edge- or center-aligned PWM, input capture, and output compare; plus a 16-channel 12-bit ADC with 2.5 µs conversion time, watermark buffering, and operation in stop3 mode. The TSI module supports up to 16 electrodes and can wake the MCU from stop3.

Key Specifications

Pinout & Package

48-pin LQFP (LF) package, 7 mm × 7 mm, 0.5 mm pitch, exposed pad not present. Pinout defined per S9S08RN60 Series Data Sheet Rev. 1 (01/2014), Table 8.2 "Device pin assignment" for 48-pin variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08RN32W1MLF, S9S08RN48W1MLF provides 16 KB additional flash and 2 KB more RAM without layout changes; versus S9KEAZ128AMLH, it retains S08 software compatibility and lower power in stop modes but lacks ARM ecosystem advantages.

Availability

S9S08RN48W1MLF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and motor drive supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S9S08RN48W1MLF 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, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The S08 RN series was developed specifically for cost-sensitive, high-reliability embedded control in harsh environments - emphasizing robust flash endurance, wide temperature operation, and integrated analog/mixed-signal peripherals.

FAQ

What is the maximum bus frequency supported by the S9S08RN48W1MLF?

The S9S08RN48W1MLF supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7 V to 5.5 V) and temperature range (-40 °C to 125 °C). This is achieved using the internal frequency-locked-loop (FLL) clock system with precision-trimmed internal reference, delivering ±2.0% accuracy over the full temperature range. The S9S08RN48W1MLF maintains timing compliance and peripheral functionality at this rate without derating.

Does the S9S08RN48W1MLF support in-circuit debugging, and what interface is used?

Yes, the S9S08RN48W1MLF supports in-circuit debugging via a single-wire background debug (BKGD) interface. This dedicated pin enables full visibility into program execution, including three hardware breakpoints, on-chip ICE trace with two comparators and nine trigger modes, and memory inspection during runtime. The S9S08RN48W1MLF does not require JTAG or SWD; BKGD is the sole standardized debug path defined in the official data sheet.

What are the low-power modes available on the S9S08RN48W1MLF, and what is the lowest achievable current draw?

The S9S08RN48W1MLF offers multiple low-power modes including reduced-power wait and stop3. In stop3 mode - the deepest sleep state - total supply current is 3.8 µA at 5 V and -40 °C to 125 °C, with only the 1 kHz LPO clock active. Optional peripherals (ADC, TSI, LVD) can be enabled as wake sources, adding 44 µA, 111 µA, or 130 µA respectively. The S9S08RN48W1MLF achieves this ultra-low current without external circuitry or configuration beyond standard register writes.

Can the S9S08RN48W1MLF's EEPROM be written while executing code from flash memory?

Yes, the S9S08RN48W1MLF's 256-byte EEPROM supports concurrent read-while-write operation: code execution from flash memory continues uninterrupted during EEPROM program or erase cycles. This capability is explicitly guaranteed in the data sheet and enables real-time parameter updates (e.g., calibration data, fault logs) without halting application logic. The S9S08RN48W1MLF implements ECC protection and 2-byte erase sectors to ensure data integrity during such operations.

Is the S9S08RN48W1MLF pin-compatible with other devices in the S08 RN family?

Yes, the S9S08RN48W1MLF is pin-compatible with the S9S08RN60W1MLF and MC9S08RN32W1MLF in the 48-pin LQFP (LF) package variant. All share identical pin assignments, electrical characteristics, and peripheral multiplexing per the S9S08RN60 Series Data Sheet. Firmware built for S9S08RN48W1MLF runs unmodified on S9S08RN60W1MLF, and vice versa - though flash size differences must be accounted for in linker scripts and memory allocation. The S9S08RN48W1MLF maintains full hardware interoperability within this 48-pin subset.