W78E054C40FL

Microcontrollers Overview

The W78E054C40FL is an 8-bit microcontroller from the W78E054C series, manufactured by Nuvoton Technology Corporation. It features a 16 KB Flash EPROM program memory and 256 bytes of on-chip RAM. The device supports a maximum operating frequency of 40 MHz with a supply voltage range of 4.5V to 5.5V. It includes four 8-bit bi-directional I/O ports, an additional 4-bit bit-addressable port (P4), three 16-bit timer/counters, a full-duplex serial port (UART), and a watchdog timer. The component is housed in a 44-pin PQFP package.

Microcontrollers Feature Summary

• Fully static 8-bit CMOS design compatible with standard 8051 instruction sets
• On-chip 16 KB electrically erasable/programmable Flash EPROM for code storage
• Integrated power management with selectable idle and power-down modes
• Built-in code protection mechanisms including lock bits and encryption logic

Microcontrollers Applications

• Security and alarm systems
• Bar code readers
• Key phone interfaces
• Industrial personal computers

Microcontrollers Procurement Notes

Verify the specific ordering suffix '40FL' corresponds to the Lead-Free RoHS compliant 44-pin PQFP package variant as documented in the datasheet. Confirm that the required operating voltage aligns with the specified 4.5V to 5.5V range, as this model does not support lower voltage inputs compared to other variants in the family. Ensure compatibility with existing PCB footprints for the 44-pin PQFP form factor during integration planning.

Microcontrollers Selection Notes

Select this component when a standard 8051 architecture with 16 KB of non-volatile memory is required for applications needing robust code protection features. The inclusion of Port 4 and additional external interrupts makes it suitable for designs requiring expanded I/O capabilities without increasing pin count significantly. Consider the 4.5V minimum supply voltage constraint when designing power systems.

Microcontrollers Part Context

This part belongs to the W78E054C/W78E54C series of 8-bit microcontrollers released by Nuvoton. The series is characterized by its wide frequency range accommodation and low power consumption capabilities. It serves as a direct upgrade or alternative to traditional 12T 8051 cores, offering enhanced peripheral integration such as Timer 2 and EMI reduction modes within a single chip solution.

Microcontrollers Replacement Considerations

W78E054C40DL (DIP 40 package)

Microcontrollers FAQ

How can EMI emission be reduced in the W78E054C?

EMI emission can be reduced by turning off the ALE signal transition using the AO bit in the AUXR SFR when accessing internal ROM. Additionally, oscillator amplifier gain can be diminished by clearing the B7 bit of the security register.

What is the function of the Power-off Flag (POF)?

The POF bit is set by hardware during a power-on reset. It allows software to determine if a reset was a warm boot or a cold boot, which can be cleared by software after detection.