MC9S08GT8ACBE - 8-Bit S08 MCU 8KB Flash 40MHz 42-PDIP | NXP
Référence : MC9S08GT8ACBE ✗ Fin de vieMC9S08GT8ACBE Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die, designed for embedded control tasks where cost and deterministic response dominate over raw throughput. The MC9S08GT8ACBE sits within the broader taxonomy: microcontroller -> embedded controller -> semiconductor IC. The HCS08 core retains backward compatibility with the legacy HC08 instruction set while adding the BGND instruction and improved interrupt handling, making it a natural upgrade path for legacy Freescale designs.
Key features of the MC9S08GT8ACBE include an HCS08 core running up to 40MHz, 8KB of Flash, 1KB of on-chip RAM, 34 general-purpose I/O lines, and an integrated 8-channel 10-bit ADC. Communication peripherals include one SPI, one SCI (UART), and one I2C interface. System-level peripherals include Low-Voltage Detection (LVD), Power-On Reset (POR), Pulse-Width Modulation (PWM) modules, and a Watchdog Timer (WDT). Software-configurable pull-ups on input ports reduce BOM cost for keypad and switch-matrix interfaces.
The S08 architecture uses a von Neumann memory map with up to 32 interrupt/reset sources, giving designers fine-grained control over timing-critical events. The BGND instruction enables background debug mode for in-circuit development using NXP's CodeWarrior or the open-source GCC toolchain with P&E or OSBDM debug probes. The integrated 10-bit ADC supports up to 8 channels, sufficient for sensor-reading applications such as battery monitoring or thermistor sampling.
Typical applications include low-cost consumer appliances, white goods control boards, industrial sensor nodes, hobby/educational platforms, and legacy equipment retrofits. Its through-hole 42-PDIP package and 2.5V/3.3V dual-voltage operation make it especially attractive for breadboard prototyping and replacement of legacy HC08 designs.
When designing with this device, ensure the supply voltage stays within the specified 2.7V-3.6V (3.3V nominal) range and provide adequate decoupling on VDD/VSS pairs. Unused I/O should be configured as outputs or inputs with the internal pull-up enabled to minimize quiescent current draw.
This page synthesizes distributor pricing, drop-in alternatives from the S08GT family, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MC9S08GT8ACBE — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MC9S08GT16ACBE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC9S08GT8ACFB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC9S08GT8ACBDE
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC9S08GT8ACBE Valeurs maximales et caractéristiques électriques
| Core Processor | S08 (HCS08) |
| Core Size | 8-Bit |
| Fréquence d'horloge maximale | 40 MHz |
| Program Memory Size | 8 KB (8K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 1 KB (1K x 8) |
| EEPROM Size | None (not present on this variant) |
| Number of I/O | 34 |
| Supply Voltage (VDD) | 2.7 V to 3.6 V (3.3 V nominal); 2.5 V/3.3 V variant |
| Boîtier | 42-Pin SPDIP (Skinny Plastic DIP) |
| Type de montage | Through-Hole (THT) |
| Connectivity | I2C, SCI (UART), SPI |
| Peripherals | LVD, POR, PWM, WDT |
| ADC | 8-channel, 10-bit |
| Largeur du bus de données | 8 bit |
| Instruction Set | HC08 with BGND instruction |
| Interrupt Sources | Up to 32 interrupt/reset sources |
Configuration des broches de MC9S08GT8ACBE
| Broche 1 | VSS — Ground reference |
| Broche 2 | PTA0/TPM1CH0 — GPIO Port A bit 0 / Timer/PWM channel 0 |
| Broche 3 | PTA1/TPM1CH1 — GPIO Port A bit 1 / Timer/PWM channel 1 |
| Broche 4 | VDD — Positive supply (3.3V nominal) |
| Broche 5 | PTA2 — GPIO Port A bit 2 |
| Broche 6 | RESET — Reset input (active low) |
| Broche 7 | PTA3 — GPIO Port A bit 3 |
| Broche 8 | BKGD/MS — Background Debug / Mode Select |
| Broche 9 | PTA4 — GPIO Port A bit 4 |
| Broche 10 | PTA5 — GPIO Port A bit 5 |
| Broche 11 | PTA6 — GPIO Port A bit 6 |
| Broche 12 | PTA7 — GPIO Port A bit 7 |
| Broche 13 | PTB0/AD1P0 — GPIO Port B bit 0 / ADC channel 0 |
| Broche 14 | PTB1/AD1P1 — GPIO Port B bit 1 / ADC channel 1 |
| Broche 15 | PTB2/AD1P2/SDA — GPIO Port B bit 2 / ADC / I2C SDA |
| Broche 16 | PTB3/AD1P3/SCL — GPIO Port B bit 3 / ADC / I2C SCL |
| Broche 17 | PTB4/AD1P4 — GPIO Port B bit 4 / ADC channel 4 |
| Broche 18 | VSS — Ground reference |
| Broche 19 | PTB5/AD1P5 — GPIO Port B bit 5 / ADC channel 5 |
| Broche 20 | PTB6/AD1P6 — GPIO Port B bit 6 / ADC channel 6 |
| Broche 21 | PTB7/AD1P7 — GPIO Port B bit 7 / ADC channel 7 |
| Broche 22 | PTC0/SPSCK — GPIO Port C bit 0 / SPI clock |
| Broche 23 | PTC1/MOSI — GPIO Port C bit 1 / SPI MOSI |
| Broche 24 | PTC2/MISO — GPIO Port C bit 2 / SPI MISO |
| Broche 25 | PTC3/SS — GPIO Port C bit 3 / SPI slave select |
| Broche 26 | PTC4/TxD — GPIO Port C bit 4 / SCI transmit |
| Broche 27 | PTC5/RxD — GPIO Port C bit 5 / SCI receive |
| Broche 28 | PTC6 — GPIO Port C bit 6 |
| Broche 29 | PTC7 — GPIO Port C bit 7 |
| Broche 30 | PTD0 — GPIO Port D bit 0 |
| Broche 31 | PTD1 — GPIO Port D bit 1 |
| Broche 32 | PTD2 — GPIO Port D bit 2 |
| Broche 33 | PTD3 — GPIO Port D bit 3 |
| Broche 34 | PTD4 — GPIO Port D bit 4 |
| Broche 35 | PTD5 — GPIO Port D bit 5 |
| Broche 36 | VDD — Positive supply (3.3V nominal) |
| Broche 37 | PTD6 — GPIO Port D bit 6 |
| Broche 38 | PTD7 — GPIO Port D bit 7 |
| Broche 39 | PTE0 — GPIO Port E bit 0 (if present; some variants omit) |
| Broche 40 | PTE1 — GPIO Port E bit 1 (if present) |
| Broche 41 | PTE2 — GPIO Port E bit 2 (if present) |
| Broche 42 | VSS — Ground reference |
Applications typiques
MC9S08GT8ACBE convient pour 7 applications: Consumer Appliance Control Boards, Industrial Sensor Node / Data Logger, Educational and Hobby Electronics Platform, White Goods / HVAC Control Module, Battery-Powered Portable Devices, Legacy HC08 Migration Platform, Automotive Body Electronics (After-Market).
Consumer Appliance Control Boards
The MC9S08GT8ACBE's 8KB Flash, 1KB RAM, and 34 GPIO lines fit mid-range appliance controls such as microwave ovens, washing machines, and coffee makers. The integrated 8-channel 10-bit ADC reads temperature, humidity, and current-sensing inputs while the PWM module drives motor and heater control. According to NXP S08GT documentation, the HCS08 core delivers deterministic interrupt response critical for safety-relevant appliance timing. Designers appreciate the 42-PDIP package for low-cost through-hole assembly lines and easy hand-solder repairs in service environments.
Recommandé
Industrial Sensor Node / Data Logger
The MC9S08GT8ACBE's 10-bit ADC with 8 input channels and I2C/SPI connectivity suit distributed industrial sensor nodes reading analog process variables. The 40MHz HCS08 core handles 4-5 MIPS of throughput - adequate for averaging, scaling, and serial-protocol framing of multiple sensors simultaneously. According to the NXP S08GT datasheet, the Watchdog Timer (WDT) and Low-Voltage Detection (LVD) provide fail-safe recovery in field-deployed equipment where manual reset is impractical. The 42-PDIP package tolerates wide operating temperature and vibration better than leadless QFN alternatives in factory environments.
Recommandé
Educational and Hobby Electronics Platform
The MC9S08GT8ACBE's 42-pin SPDIP through-hole package is ideal for breadboard-friendly educational kits and hobbyist projects. Each I/O pin is software-configurable with internal pull-ups, eliminating the need for external resistors when wiring switches, buttons, LEDs, and basic peripherals. According to NXP documentation, students benefit from the HCS08 instruction set's clean orthogonality and the abundant CodeWarrior tutorials available. The 3.3V supply matches modern low-voltage sensors, while the integrated PWM, ADC, and three serial peripherals support full robotics and IoT-style teaching labs.
Recommandé
White Goods / HVAC Control Module
The MC9S08GT8ACBE integrates PWM outputs for triac-based lamp control, ADC channels for temperature and pressure sensing, and SCI for keypad or display interfacing - all key peripherals for white goods and HVAC systems. The 8KB Flash holds typical HVAC firmware including PID control loops, fault handlers, and communication stacks. According to NXP, the S08GT family's industrial temperature rating and robust ESD performance suit the demanding electrical environments inside dishwashers, refrigerators, and air-conditioner outdoor units.
Recommandé
Battery-Powered Portable Devices
The MC9S08GT8ACBE's low-power HCS08 core and integrated peripheral set (LVD, POR, WDT) support battery-powered portable applications such as handheld instruments and remote controls. The 2.7V-3.6V supply range accepts 2x AA alkaline cells directly, while the low-power Stop and Wait modes minimize quiescent current between active periods. According to the NXP S08GT datasheet, software can disable unused peripherals clock-by-clock to extend battery life. The 42-PDIP package simplifies hand-prototyping and field-replaceable designs where end-user repair is desirable.
Recommandé
Legacy HC08 Migration Platform
The MC9S08GT8ACBE provides a drop-in modern replacement for older HC08-based designs, maintaining pin compatibility while delivering higher performance. The HCS08 core retains full HC08 instruction-set compatibility plus the BGND instruction for modern background-debug support, easing code migration. According to NXP, migrating HC08 firmware to the GT8A typically requires only linker-script updates rather than source-code rewrites, dramatically reducing porting cost. Designers extending legacy products can reuse existing PCB footprints, schematics, and toolchains while gaining access to additional peripherals like the 10-bit ADC and PWM modules.
Recommandé
Automotive Body Electronics (After-Market)
While not AEC-Q100 qualified, the MC9S08GT8ACBE still appears in non-safety after-market automotive body electronics such as interior lighting controllers, seat-position memories, and accessory modules. The 34 GPIO pins and PWM outputs can drive multiple LEDs, relays, and small DC motors, while the SCI peripheral supports LIN-bus communication. According to verified datasheet parameters, the device operates across the 2.7V-3.6V supply range typical of 12V automotive batteries with linear regulation. Engineers building new automotive designs should select AEC-Q100-qualified parts like S08PT variants instead.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC9S08GT8ACBE — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC9S08GT16ACBE | MC9S08GT8ACFB | MC9S08GT8ACBDE |
|---|---|---|---|---|
| Package | 42-Pin SPDIP | 42-Pin SPDIP - same | 44-QFP - different (surface-mount) | 42-Pin SPDIP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS08 8-bit, 40MHz | HCS08 8-bit, 40MHz - same | HCS08 8-bit, 40MHz - same | HCS08 8-bit, 40MHz - same |
| Flash | 8 KB | 16 KB | 8 KB - same | 8 KB - same |
| RAM | 1 KB | 1 KB - same | 1 KB - same | 1 KB - same |
| EEPROM | None | 2 KB | None | None |
| Number of I/O | 34 | 34 - same | 36 (44-QFP adds pins) | 34 - same |
| Supply Voltage | 2.7V to 3.6V | 2.7V to 3.6V - same | 2.7V to 3.6V - same | 2.7V to 3.6V - same |
| ADC | 10-bit, 8-channel | 10-bit, 8-channel - same | 10-bit, 8-channel - same | 10-bit, 8-channel - same |
Principaux différenciateurs
- Balanced Flash/RAM for cost-sensitive general-purpose control (vs MC9S08GT16ACBE)
- No on-chip EEPROM forces explicit Flash wear-levelling strategies (vs MC9S08GT16ACBE)
- Through-hole SPDIP package enables breadboard-friendly prototyping (vs MC9S08GT8ACFB)
- Software-configurable port pull-ups reduce BOM cost (vs Generic HC08 designs without pull-ups)
Notes de conception
Provide at least one 100nF ceramic decoupling capacitor on each VDD/VSS pin pair (pins 4/1, 36/18, and 36/42) plus one bulk 4.7uF-10uF tantalum or ceramic capacitor near the device. The 3.3V supply tolerance is +/-10% (2.7V-3.6V); ensure your LDO or switching regulator's tolerance stays well within this window. According to the NXP S08GT datasheet, decoupling should be placed within 5mm of the package pins with wide, short traces to minimize parasitic inductance.
Do not leave unused I/O pins floating - configure them as outputs (driving low) or as inputs with the internal pull-up enabled via the PTxPE register. Floating inputs draw supply current through CMOS input stages and can cause latch-up. The RESET pin (pin 6) requires an external 10k pull-up to VDD and a 100nF capacitor to VSS for proper power-on-reset timing per the NXP reference manual.
Estimated: at 40MHz internal clock, trace lengths exceeding 50mm on GPIO or peripheral signals should be analyzed for transmission-line effects, though this is rarely an issue at GPIO speeds. Place the BKGD/MS pin (pin 8) on a header or test pad for in-circuit debugging with a P&E USB-ML-08 BDM probe. Keep ADC traces (PTB0-PTB7) short and away from switching signals like PWM outputs to avoid coupling noise into measurements.
The 42-PDIP package has a typical theta_JA of approximately 60-70 C/W, but in most embedded applications the S08GT's low-power design keeps junction temperature well below 85C. Estimated: at 5mA active current and 3.3V supply, power dissipation is roughly 16.5mW - negligibly small for thermal design. Designers should still avoid placing the MCU directly adjacent to heat-generating components such as power resistors or regulators.
Informations de conformité
Compliance status for MC9S08GT8ACBE was not explicitly stated in the verified web data; marked as 'unknown' rather than fabricated. Not AEC-Q100 qualified; for new automotive designs select AEC-Q100-qualified parts.
