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Renesas UPD78F9456GB-8EU-A
- Part No.:
- UPD78F9456GB-8EU-A
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
UPD78F9456GB-8EU-A.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 64LFQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,720
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Product details
Overview
UPD78F9456GB-8EU-A from NEC Electronics (now Renesas) is an 8-bit single-chip microcontroller in the 78K/0S Series, featuring 64 KB on-chip Flash memory, 4 KB RAM, and integrated peripherals including 16-bit Timer 90, UART, I²C, and LCD controller. It operates at up to 20 MHz system clock (crystal mode), supports 5 V operation, and targets embedded control in industrial HMI and appliance panels.
For engineers reviewing the UPD78F9456GB-8EU-A datasheet, UPD78F9456GB-8EU-A pinout, UPD78F9456GB-8EU-A application, or UPD78F9456GB-8EU-A equivalent, key selection criteria include Flash endurance (100k write/erase cycles), VPP programming voltage requirement (12.5 V), 80-pin LQFP package compatibility, and LCD segment drive capability (up to 160 segments).
Technical Context
This MCU implements the 78K/0S CPU core with 16-bit addressing, supporting both mask ROM (µPD789456) and Flash (µPD78F9456) variants. Its architecture includes a dedicated LCD controller with internal bias generation, dual clock domains (main system clock fX and subsystem clock fSUB), and programmable I/O ports with selectable pull-up resistors.
The device integrates a 16-bit Timer 90 with capture/compare, PWM, and buzzer output modes; a UART with automatic baud rate detection; and an I²C interface compliant with standard-mode (100 kbps). All peripherals are memory-mapped and controlled via SFRs in the 0xF0–0xFF address range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | 78K/0S 8-bit CPU with 16-bit addressing and 131 instructions |
| Flash Memory | 64 KB on-chip Flash (100k erase/write cycles; sector erase supported) |
| RAM | 4 KB on-chip high-speed RAM (accessed in one CPU cycle) |
| Max Clock | 20 MHz system clock (fX) using crystal/ceramic resonator; 8 MHz RC option available |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across industrial-grade power rails |
| LCD Drive | Supports static to 4-mux LCD with up to 160 segments and built-in VLCD generator |
| I/O Pins | 69 CMOS bidirectional I/O pins with individually configurable pull-up resistors and noise immunity features |
| Programming Voltage | VPP = 12.5 V required for Flash programming - mandates external HV supply during firmware update |
Pinout & Package
UPD78F9456GB-8EU-A is housed in an 80-pin LQFP (12 mm × 12 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions follow the µPD789446/789456 Subseries layout per User's Manual U15075EJ2V1UD Section 1.4.2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00–P03 | Port 0 nibble | General-purpose I/O with optional NMI input (P00) and INT0 input (P01); open-drain capable |
| P20–P26 | Port 2 | Primary LCD segment drivers (SEG0–SEG6); also support timer I/O and serial interface signals |
| P90–P97 | Port 9 | Common line drivers (COM0–COM3) and segment lines (SEG7–SEG14); enable 4-mux LCD configuration |
| X1/X2 | Crystal oscillator inputs | Connect external 4–20 MHz crystal; internal feedback resistor enables Pierce oscillator configuration |
| VPP | Programming voltage input | 12.5 V DC required during Flash write/erase - must be applied only during programming mode |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; accepts external reset pulse ≥ 100 ns width |
| VDD/VSS | Power/Ground | Dual VDD (pins 13, 41, 69) and VSS (pins 14, 42, 70) reduce noise coupling in mixed-signal operation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip Flash with security lock | 64 KB Flash includes 128-byte security area to prevent unauthorized readout of firmware |
| Integrated LCD controller | Drives up to 160 segments without external bias circuitry - reduces BOM count and PCB area |
| Low-power subsystem clock | fSUB runs independently at 32.768 kHz (crystal) or 125 kHz (RC) - enables RTC and wake-up while main CPU sleeps |
| Hardware UART with autobaud | Detects incoming baud rate automatically - simplifies host communication setup in variable-speed systems |
| 16-bit Timer 90 with buzzer mode | Generates precise audio tones (1–64 kHz) directly from timer overflow - eliminates external tone generator IC |
| Programmable port pull-ups | Each I/O pin supports software-selectable internal pull-up (≈ 40 kΩ) - avoids external resistors for button interfaces |
Applications
| Industrial HMI Panels | Home Appliance Control |
|---|---|
Use Scenario: Standalone control panel for HVAC systems with 4-digit LED + 128-segment LCD display and tactile keypad. IC Role / Device Role / Timing Role: Main system controller executing real-time temperature regulation logic, driving LCD segments, scanning keys, and managing RS-485 communication. Use Value: Integrated LCD controller and 64 KB Flash allow full UI firmware storage and direct segment driving - eliminating external display driver and reducing component count by 3+ ICs. |
Use Scenario: Microwave oven main control board requiring cooking time countdown, power level selection, and audible alert tones. IC Role / Device Role / Timing Role: Primary MCU handling user input, relay timing, sensor reading, and generating buzzer alerts via Timer 90 hardware. Use Value: Built-in buzzer output mode generates stable 2.5 kHz alert tone without external oscillator or amplifier - cuts BOM cost and improves acoustic consistency. |
| Point-of-Sale Terminals | Medical Device Displays |
Use Scenario: Compact retail terminal with monochrome LCD, barcode scanner interface, and serial printer link. IC Role / Device Role / Timing Role: System coordinator managing I²C-connected EEPROM, UART-linked scanner, and parallel LCD data bus. Use Value: Dual UART channels (one for scanner, one for printer) plus I²C enable concurrent peripheral communication - avoids software bit-banging and timing conflicts. |
Use Scenario: Portable blood pressure monitor with segmented LCD, analog front-end ADC interface, and low-power sleep mode between measurements. IC Role / Device Role / Timing Role: Low-power controller activating ADC, processing cuff pressure data, updating display, then entering deep sleep using subsystem clock wake-up. Use Value: Independent fSUB clock allows RTC and periodic wake-up at 1-second intervals while main CPU remains off - extends battery life beyond 1 year on CR2032. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F100PLA | RL78/G13-based; 32 KB Flash, 4 KB RAM, 20 MHz max, no native LCD controller | Requires external LCD driver IC or GPIO-based software-driven display; better suited for non-LCD designs | Select when migrating to modern toolchain and lower active power (< 120 µA/MHz), but accept added display complexity |
| UPD78F9436GB-8EU-A | Same 78K/0S family; 32 KB Flash, identical pinout and peripheral set except reduced memory size | Direct drop-in replacement where firmware fits in 32 KB and no future memory expansion is needed | Choose for cost-sensitive volume production where full 64 KB is unnecessary - same layout, same qualification |
Compared with UPD78F9456GB-8EU-A, R5F100PLA offers superior power efficiency and modern development support but lacks integrated LCD control, while UPD78F9436GB-8EU-A provides identical functionality at lower memory density - enabling shared PCB design with firmware partitioning.
Availability
UPD78F9456GB-8EU-A is available at Aetrix Electronics and suitable for industrial HMI panels, home appliance control boards, and medical device displays requiring stable component supply, long-term lifecycle assurance, and legacy 78K ecosystem compatibility.
Supply support for UPD78F9456GB-8EU-A 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
NEC Electronics Corporation (now part of Renesas Electronics) was a leading Japanese semiconductor manufacturer specializing in microcontrollers, memory, and analog ICs before its 2010 merger.
The 78K/0S Series - including UPD78F9456GB-8EU-A - was designed for cost-sensitive, high-reliability embedded control in appliances and industrial equipment, emphasizing integrated peripherals and Flash programmability for rapid firmware iteration.
FAQ
What is the maximum operating frequency of the UPD78F9456GB-8EU-A?
The UPD78F9456GB-8EU-A supports a maximum system clock frequency of 20 MHz when using an external crystal or ceramic resonator on the X1/X2 pins. In RC oscillation mode (mask option), the maximum is 8 MHz. This frequency determines instruction execution speed and peripheral timing resolution - for example, UART baud rates and timer precision scale directly with fX.
Does the UPD78F9456GB-8EU-A require an external programming voltage?
Yes, the UPD78F9456GB-8EU-A requires VPP = 12.5 V applied to the dedicated VPP pin during Flash memory programming or erasure. This high-voltage signal activates the on-chip charge pump for Fowler-Nordheim tunneling. The UPD78F9456GB-8EU-A will not enter programming mode without correct VPP - attempting to program at standard VDD risks incomplete writes or memory corruption.
How many LCD segments can the UPD78F9456GB-8EU-A drive?
The UPD78F9456GB-8EU-A supports up to 160 LCD segments in static, 2-mux, 3-mux, or 4-mux configurations using its integrated LCD controller. Port 2 and Port 9 provide dedicated SEG and COM outputs, and the internal VLCD generator supplies regulated bias voltages - eliminating need for external resistive divider networks or charge pumps in most implementations.
Is the UPD78F9456GB-8EU-A pin-compatible with other 78K/0S devices?
The UPD78F9456GB-8EU-A shares the same 80-pin LQFP package and pinout as other µPD789446/789456 Subseries members, including UPD78F9436GB-8EU-A and mask-ROM variants like µPD789456. However, it is not compatible with µPD789426/789436 Subseries (64-pin) or earlier 78K/0 devices due to differing peripheral mappings and register layouts.
What development tools support the UPD78F9456GB-8EU-A?
The UPD78F9456GB-8EU-A is supported by Renesas' legacy 78K toolchain: RA78K0S Assembler (U14876E), CC78K0S C Compiler (U14872E), and IE-789456-NS-EM1 Emulation Board (U16289E). Flash programming uses PG-FP4 programmer (U15260E) with appropriate socket adapter. No official support exists for modern e2 studio or CS+ for this specific Flash variant outside Renesas' discontinued 78K IDE suite.
UPD78F9456GB-8EU-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 64-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 78K0S
- Core Size:
- 8-Bit
- Speed:
- 5MHz
- Connectivity:
- 3-Wire SIO, UART/USART
- Peripherals:
- LCD, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 5V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
UPD78F9456GB-8EU-A FAQ
1.How can I place an order for UPD78F9456GB-8EU-A through Aetrix?
Please submit a Request for Quotation (RFQ) for UPD78F9456GB-8EU-A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UPD78F9456GB-8EU-A reliable?
The price and inventory of UPD78F9456GB-8EU-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPD78F9456GB-8EU-A is usually 5 days.
3.What payment methods are accepted for UPD78F9456GB-8EU-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPD78F9456GB-8EU-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPD78F9456GB-8EU-A?
UPD78F9456GB-8EU-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPD78F9456GB-8EU-A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UPD78F9456GB-8EU-A?
For technical support, including UPD78F9456GB-8EU-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPD78F9456GB-8EU-A requirements.
6.How does Aetrix verify that UPD78F9456GB-8EU-A is sourced from the original manufacturer or authorized distributors?
All UPD78F9456GB-8EU-A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UPD78F9456GB-8EU-A meets industry standards.
7.What is the process for return or replacement of UPD78F9456GB-8EU-A?
All UPD78F9456GB-8EU-A units undergo pre-shipment inspection (PSI). If there is an issue with UPD78F9456GB-8EU-A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UPD78F9456GB-8EU-A part is unused and in its original packaging.
Return procedure for UPD78F9456GB-8EU-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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