Renesas HD64F3854H

Overview

HD64F3854H from Renesas Electronics is an 8-bit single-chip microcontroller in the H8/3854 Group, featuring 60 KB on-chip flash memory (F-ZTAT™), 2 KB RAM, a 640-dot LCD controller, 4-channel 10-bit A/D converter, single serial communication interface (SCI), and three timer types - all integrated for embedded LCD-based control systems operating at up to 20 MHz CPU frequency with 3.0–5.5 V supply.

For engineers reviewing the HD64F3854H datasheet, HD64F3854H pinout, HD64F3854H application, or HD64F3854H equivalent, this device serves as a field-programmable MCU targeting cost-sensitive industrial displays, portable instrumentation, and appliance control where post-mount firmware updates and integrated display driving are required.

Technical Context

The HD64F3854H implements the H8/300L CPU core with full instruction set compatibility to the H8/300, supporting both high-speed (up to 20 MHz) and medium-speed (up to 19.2 kHz) operation modes. Its F-ZTAT™ flash architecture enables in-system programming with 32-byte write granularity and block-wise erase (1 KB, 12 KB, 16 KB, or 28 KB blocks).

On-chip peripherals include a dedicated 640-dot static/dynamic LCD controller with 640-bit display RAM, a 4-channel 10-bit successive-approximation A/D converter with sample-and-hold, and a single full-duplex SCI supporting asynchronous communication - all synchronized to the internal clock without external components.

Key Specifications

Pinout & Package

HD64F3854H is housed in a 100-pin FP-100B plastic flat package (14 mm × 14 mm), with 24 general-purpose I/O ports, 5 dedicated input-only pins, and dedicated signal groups for LCD segment/common drivers, SCI, A/D inputs, timers, and reset/control functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3854H, HD64F3854 offers identical functionality in a smaller package but reduced thermal mass, while HD6433854 trades programmability for lower unit cost and smaller silicon die - making the H variant optimal for prototyping, low-volume customization, and field-serviceable devices.

Availability

HD64F3854H is available at Aetrix Electronics and suitable for industrial panel meters, portable medical instruments, and home appliance control panels requiring stable component supply across extended product lifecycles.

Supply support for HD64F3854H 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8/3854 Group - including HD64F3854H - was designed specifically for cost-effective, LCD-integrated embedded control in appliances, instrumentation, and human-interface applications where flash programmability and mixed-signal integration are critical.

FAQ

What is the maximum CPU clock frequency supported by HD64F3854H?

The HD64F3854H supports a maximum CPU clock frequency of 20 MHz in high-speed active mode. This timing is guaranteed over the full operating voltage range (3.0 V to 5.5 V) and temperature range (–20°C to +75°C). The device also supports medium-speed operation down to 19.2 kHz for ultra-low-power applications, with independent clock domains for peripherals and real-time clock functions.

Does HD64F3854H include on-chip debug capability for firmware development?

Yes, HD64F3854H supports on-chip debugging via the on-chip debug interface (OCD) using the Renesas E8/E8a emulator or compatible JTAG adapters. This enables real-time breakpoint setting, register inspection, and memory read/write during development - essential for validating LCD timing, A/D sampling accuracy, and SCI communication protocols without external probes.

Can HD64F3854H drive a 1/4-duty LCD without external bias circuitry?

Yes, HD64F3854H's integrated LCD controller supports static, 1/2, 1/3, and 1/4 duty drive methods natively, with programmable bias voltage generation and internal voltage follower outputs. It delivers the required VLCD, V0, and V1–V3 voltages directly - eliminating need for external resistive divider networks or charge-pump ICs in most 1/4-duty segment LCD configurations.

What is the erase granularity and endurance rating of the F-ZTAT™ flash in HD64F3854H?

The F-ZTAT™ flash in HD64F3854H is erased in blocks of 1 KB, 12 KB, 16 KB, or 28 KB, and programmed in 32-byte units. Renesas specifies a minimum endurance of 10,000 erase/write cycles per block under standard operating conditions (Ta = 25°C, VCC = 5.0 V), with data retention exceeding 20 years at 85°C.

Is HD64F3854H qualified for automotive applications?

No, HD64F3854H is rated as a "Standard" quality grade device per Renesas classification and is intended for industrial, consumer, and office equipment - not automotive or safety-critical systems. It lacks AEC-Q100 qualification, extended temperature range (–40°C to +125°C), and automotive-specific reliability testing. For automotive use, consult Renesas' RL78 or RH850 families.