NXP Semiconductors MC9S08SH8CSC

Overview

MC9S08SH8CSC from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB flash memory, 512 B RAM, and integrated peripherals including 10-bit ADC, analog comparator, SCI, SPI, I²C, two TPM modules, RTC, and MTIM. It operates across -40°C to 85°C with 2.7–5.5 V supply and supports stop3 mode for ultra-low-power wake-up via real-time interrupt.

For engineers reviewing the MC9S08SH8CSC datasheet, MC9S08SH8CSC pinout, MC9S08SH8CSC application, or MC9S08SH8CSC equivalent, key selection criteria include QFN-24 package compatibility, internal clock source (ICS) with FLL for 2–20 MHz bus frequency, single-wire background debug interface, and peripheral support for sensor interfacing, motor control, and LIN-compliant communication in cost-sensitive embedded systems.

Technical Context

The MC9S08SH8CSC implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources and on-chip ICE debug module with two comparators and eight-deep FIFO. Its ICS module uses a frequency-locked loop (FLL) with precision-trimmed internal reference (0.2% resolution, ±2% deviation over voltage/temperature) to generate stable system clocks.

Peripherals are designed for mixed-signal operation: the 12-channel 10-bit ADC achieves 2.5 µs conversion time and runs in stop3 mode; the analog comparator supports edge-triggered interrupts and routing to TPM; the RTC uses a free-running 1 kHz low-power oscillator for cyclic wake-up without external components.

Key Specifications

Pinout & Package

MC9S08SH8CSC is housed in a 24-pin QFN package (case outline 98ASA00474D), measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. The package supports copper-wire bonding per Freescale's QFN migration addendum and is optimized for compact PCB layouts and thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8CSC, MC9S08QG8CDT offers lower memory and fewer peripherals in identical packaging for cost-sensitive volume production, while S9KEAZ128AMLH provides architectural expansion into 32-bit with advanced interfaces - neither is pin-compatible, requiring layout revision for adoption.

Availability

MC9S08SH8CSC is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, automotive body electronics, and consumer remote systems requiring stable component supply, long-lifecycle support, and verified QFN-24 sourcing.

Supply support for MC9S08SH8CSC 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

Freescale Semiconductor (now part of NXP Semiconductors since 2015) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SH8CSC belongs to the HCS08 microcontroller family, engineered for cost-effective, low-power 8-bit control in resource-constrained applications where reliability, debug capability, and mixed-signal integration are essential.

FAQ

What is the maximum operating frequency of the MC9S08SH8CSC CPU core?

The MC9S08SH8CSC 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 with appropriate FLL settings and external conditions - such as supply voltage (2.7–5.5 V) and temperature (-40°C to +85°C) - meet specification limits. The actual bus frequency depends on ICS configuration and may range from 2 MHz to 20 MHz under typical use cases.

Does the MC9S08SH8CSC support in-system programming via its debug interface?

Yes, the MC9S08SH8CSC supports in-system programming using its single-wire background debug (BKGD) interface. This allows full flash memory read, program, and erase operations without removing the device from the target board. The interface requires only one dedicated pin (BKGD/MS) and is compatible with standard Freescale/NXP debug tools such as the OSBDM or Cyclone Pro programmers.

What power-saving modes does the MC9S08SH8CSC offer, and which ones retain RTC functionality?

The MC9S08SH8CSC provides three primary low-power modes: wait, stop2, and stop3. Only stop3 retains full RTC operation using its dedicated 1 kHz internal low-power oscillator - enabling precise timekeeping and wake-up events without external components. In stop3, the ADC, ACMP, and most peripherals remain disabled, but the RTC continues running and can generate interrupts to resume execution.

Can the MC9S08SH8CSC operate without an external crystal or resonator?

Yes, the MC9S08SH8CSC can operate entirely without an external crystal or resonator by relying on its internal clock source (ICS) module. The ICS uses a frequency-locked loop (FLL) with a precision-trimmed internal reference to generate stable system clocks from 2 MHz to 20 MHz. This eliminates the need for external timing components in many applications, reducing bill-of-materials cost and PCB area.

What is the function of the ganged output feature on ports PTB and PTC of the MC9S08SH8CSC?

The ganged output feature on PTB[5:2] and PTC[3:0] allows a single write operation to simultaneously update four output pins - useful for driving multi-segment LEDs, relay banks, or display elements. This atomic update avoids intermediate states during bit-by-bit writes and simplifies firmware logic. The feature is implemented in hardware and requires no additional clock cycles or software overhead beyond the register write itself.