NXP Semiconductors MC9S08PA4AVSC

Overview

MC9S08PA4AVSC from NXP Semiconductors is an 8-bit S08 microcontroller designed for cost-sensitive, low-power embedded control applications. It features a 20 MHz bus frequency across 2.7–5.5 V operation, 4 KB flash, 512 byte RAM, and 128 byte EEPROM with in-circuit programmability. Its integrated 8-channel 12-bit ADC, three 2-channel FlexTimer modules, and single analog comparator support sensor interfacing and motor control in industrial and automotive subsystems.

For engineers reviewing the MC9S08PA4AVSC datasheet, MC9S08PA4AVSC pinout, MC9S08PA4AVSC application, or MC9S08PA4AVSC equivalent, key selection considerations include its 8-pin SOIC package, -40°C to +105°C operating range, 20 mA high-drive output capability on PTB4/PTB5, LIN-capable SCI interface, and background debug (BKGD) support for in-circuit development.

Technical Context

The MC9S08PA4AVSC implements an enhanced S08 CPU core with up to four-level nested interrupt handling and support for 40 interrupt/reset sources. Its clock system combines an external crystal/ceramic oscillator (31.25 kHz–20 MHz) and an internal clock source (ICS) with FLL-based frequency multiplication and factory-trimmed reference (±1% over 0–70°C).

System-level protection includes a watchdog timer with independent 1 kHz LPO clock, configurable low-voltage detect/warning thresholds (e.g., VLVDH = 4.3 V), illegal opcode/address detection, and flash/RAM access protection. Power management supports Stop3 mode with ~1.5 µA typical current and peripheral clock gating to minimize active-mode consumption.

Key Specifications

Pinout & Package

MC9S08PA4AVSC is housed in an 8-pin SOIC package (CC = SC per part number format), with pin assignments optimized for minimal footprint while retaining essential I/O: VDD, VSS, RESET, BKGD/MS, XTAL/EXTAL, and two high-drive GPIOs (PTB4/PTB5). The package supports reflow soldering per J-STD-020 MSL3 and operates across -40°C to +105°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08PA4AVSC, S9S08PA4AVSC offers identical functionality under updated NXP part numbering, while MC9RS08KA2CSC trades peripheral richness and interrupt depth for lower unit cost-making it viable only in non-analog, non-real-time control roles.

Availability

MC9S08PA4AVSC is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, smart appliance subsystems, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08PA4AVSC 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in microcontrollers, RF, and analog technologies.

The MC9S08PA4AVSC belongs to NXP's S08 8-bit MCU family, engineered for cost-optimized, low-power embedded control in space-constrained environments where analog integration, robust debug, and extended temperature operation are critical.

FAQ

What is the maximum operating frequency of the MC9S08PA4AVSC?

The MC9S08PA4AVSC supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7–5.5 V) and temperature range (–40°C to +105°C). This frequency is achieved using either the internal clock source (ICS) with FLL or an external crystal/resonator up to 20 MHz. The actual core instruction throughput depends on bus speed and instruction cycle count, but all timing specifications-including ADC conversion and FTM operation-are validated at 20 MHz.

Does the MC9S08PA4AVSC support in-system programming of flash memory?

Yes, the MC9S08PA4AVSC supports full in-system programming of its 4 KB flash memory, including read, program, and erase operations while the device is powered and executing code from other memory regions. This capability enables field firmware updates without removing the IC from the PCB. Flash endurance is rated for 10,000 erase/program cycles, and sector erase granularity is configurable down to 2-byte boundaries in EEPROM emulation mode.

Which pins on the MC9S08PA4AVSC provide high-current drive capability?

The MC9S08PA4AVSC provides ultra-high-current drive capability exclusively on pins PTB4 and PTB5, each supporting up to 20 mA sink or source current. These pins are designated in the datasheet as "high-drive" outputs and are electrically distinct from standard GPIOs. They retain this capability across the full operating voltage range (2.7–5.5 V) and temperature range (–40°C to +105°C), making them suitable for direct LED driving or small relay coil control without external buffers.

Can the MC9S08PA4AVSC operate in low-power modes while maintaining analog functionality?

Yes, the MC9S08PA4AVSC supports analog operation in Stop3 mode: the 12-bit ADC can perform conversions, the analog comparator (ACMP) remains active for wake-up triggering, and the internal bandgap reference stays enabled. In Stop3, total current consumption drops to ≤1.5 µA @ 5 V, with only the 1 kHz LPO clock running. ADC conversions require explicit wake-up and bus clock restart, but ACMP output changes can generate interrupts without full wake-up, enabling event-driven low-power sensing.

What debug interface does the MC9S08PA4AVSC use, and what are its capabilities?

The MC9S08PA4AVSC uses a single-wire background debug (BKGD) interface compliant with NXP's BDM protocol. It supports in-circuit debugging with three hardware breakpoints, real-time register and memory inspection, and flash programming via standard tools like P&E Multilink or OSJTAG. The BKGD pin (PTA4/BKGD/MS) is output-only during normal operation and requires no additional pins-enabling debug on the 8-pin SOIC package without sacrificing I/O count. On-chip ICE debug logic provides nine trigger modes and two comparators for advanced trace analysis.