Renesas HD64F3642APV

Overview

HD64F3642APV from Renesas is an 8-bit single-chip microcontroller in the H8/300L family, featuring a 10 MHz max CPU clock, on-chip 32 KB flash memory, 2 KB RAM, and integrated peripherals including a 10-bit A/D converter, five timers, 14-bit PWM, and dual serial interfaces (SCI). It operates at 2.5–5.5 V and targets embedded motor control and industrial automation systems.

For engineers reviewing the HD64F3642APV datasheet, HD64F3642APV pinout, HD64F3642APV application, or HD64F3642APV equivalent, key selection criteria include its flash-based programmability, low-power sleep modes (down to 1 mA), SCI3 serial timing compliance at 2.5–5.5 V, and H8/300L instruction set compatibility with legacy code bases.

Technical Context

The HD64F3642APV implements the H8/300L CPU core with full backward compatibility to the H8/300 instruction set and supports multiple power-down modes-Sleep, Standby, Watch, Subsleep, Subactive, and Active (Medium-Speed)-each with defined clock gating and current consumption profiles. Its flash memory supports in-system programming via boot mode with dedicated FLMCR, EBR1, and EBR2 registers.

Peripheral integration includes two independent serial communication interfaces (SCI1 and SCI3) supporting asynchronous communication with programmable baud rates, a 10-bit A/D converter with 8 input channels, and a 14-bit PWM module capable of complementary output generation for three-phase motor drive applications.

Key Specifications

Pinout & Package

HD64F3642APV is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with standard I/O port mapping, power/ground distribution, and dedicated pins for reset, clock input (XIN/XOUT), and serial interface signals (TXD/RXD/SCK).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3643APV and HD64F3644APV, the HD64F3642APV provides the minimal sufficient memory and peripheral set for cost-sensitive motor control and sensor interface applications-reducing bill-of-materials cost while retaining full H8/300L software compatibility and identical power management features.

Availability

HD64F3642APV is available at Aetrix Electronics and suitable for industrial motor control, smart power supply monitoring, and embedded HVAC controller designs requiring stable component supply across long-lifecycle production programs.

Supply support for HD64F3642APV 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 Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The H8/3642A F-ZTAT™ product line was designed for cost-effective, flash-based embedded control in non-automotive industrial equipment-emphasizing low-power operation, integrated analog/motor peripherals, and long-term supply stability.

FAQ

What is the maximum operating frequency of the HD64F3642APV?

The HD64F3642APV supports a maximum system clock frequency of 10 MHz. This is achieved using an external crystal or ceramic resonator connected to the XIN/XOUT pins, with internal prescalers enabling flexible division ratios for peripheral clocks. The 10 MHz limit ensures deterministic instruction execution timing and meets the electrical AC characteristics specified in the hardware manual for all I/O and memory access operations under rated voltage and temperature conditions. HD64F3642APV maintains full functionality across its entire operating range.

Does the HD64F3642APV include on-chip flash memory, and what is its capacity?

Yes, the HD64F3642APV integrates 32 KB of on-chip flash memory for program storage. This flash supports in-system programming via boot mode using the dedicated Flash Memory Control Register (FLMCR) and Erase Block Registers (EBR1/EBR2). It allows full erase, program, and verify cycles without external hardware programmers. HD64F3642APV's flash architecture enables field firmware updates and eliminates the need for external EPROM sockets, reducing system cost and board space.

How many serial communication interfaces does the HD64F3642APV support?

The HD64F3642APV supports two independent serial communication interfaces: SCI1 and SCI3. Each is a full-duplex asynchronous UART with programmable baud rates, framing options (data bits, stop bits, parity), and interrupt-driven operation. SCI3 timing is explicitly characterized across 2.5–5.5 V supply and –20°C to +75°C ambient, making it suitable for robust industrial communication links. HD64F3642APV uses these interfaces for host connectivity, sensor polling, or inter-controller messaging without shared resources.

What power management modes are available on the HD64F3642APV?

The HD64F3642APV offers six configurable power-down modes: Sleep, Standby, Watch, Subsleep, Subactive, and Active (Medium-Speed). Each mode selectively gates clocks to CPU, peripherals, and memory blocks to reduce current draw-from ~1 mA in Sleep mode to ~15 mA in Active (High-Speed) mode. Mode transitions are controlled via system control registers and respond to internal events or external interrupts. HD64F3642APV's granular power control enables energy-efficient operation in battery-backed or thermally constrained industrial applications.

Is the HD64F3642APV pin-compatible with other members of the H8/364x family?

Yes, the HD64F3642APV shares the same 100-pin LQFP package and pin assignment with HD64F3643APV and HD64F3644APV, enabling drop-in replacement within the same footprint. All three variants maintain identical I/O port mapping, reset behavior, clock interface, and peripheral signal locations. However, differences in flash size (32 KB vs. 64 KB vs. 128 KB) and presence of the D/A converter in HD64F3644APV mean firmware and schematic review is required before substitution. HD64F3642APV serves as the baseline variant for this pin-compatible group.