Renesas HD6473937RXV

Overview

HD6473937RXV from Renesas Technology Corp. is a single-chip 16-bit microcontroller in the H8/3937R Series, featuring an H8/300L CPU core, integrated FLEX™ decoder for pager applications, five timers, dual-channel serial interface (SCI), and 8-channel 10-bit A/D converter. It operates at up to 16 MHz with 64 KB on-chip ROM and 2 KB RAM, targeting low-power embedded systems requiring roaming capability.

For engineers reviewing the HD6473937RXV datasheet, HD6473937RXV pinout, HD6473937RXV application, or HD6473937RXV equivalent, key selection considerations include FLEX decoder support, roaming-mode operation, 10-bit ADC resolution, SCI dual-channel configuration, and power-down mode flexibility across Sleep, Standby, Watch, Subsleep, and Subactive states.

Technical Context

The HD6473937RXV implements the H8/300L CPU instruction set-fully compatible with the H8/300-and integrates a dedicated FLEX™ decoder hardware block for real-time decoding of Motorola FLEX protocol messages. Its memory map includes 64 KB ROM (mask-programmed), 2 KB RAM, and register-mapped peripheral control space.

Power management is handled via six operational modes: Active (medium-speed), Subactive, Subsleep, Watch, Standby, and Sleep-with oscillator settling times, clock gating, and pin-state retention explicitly defined per mode. The device supports both system clock (up to 16 MHz) and subclock (32.768 kHz) domains for precise timing and ultra-low-power wake-up.

Key Specifications

Pinout & Package

HD6473937RXV is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package. Pin functions are fully documented in Section 1.3 of the Hardware Manual ADE-602-218 (Rev. 1.0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD6473937RXV, HD64F3937R trades mask-ROM permanence for field-upgradability, while HD6473937 removes roaming capability to simplify system design-both share identical packaging, clock architecture, and peripheral register maps, enabling partial hardware reuse.

Availability

HD6473937RXV is available at Aetrix Electronics and suitable for pager infrastructure, two-way messaging terminals, industrial alert gateways, and low-power remote sensor hubs requiring stable component supply and long-term lifecycle support.

Supply support for HD6473937RXV 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. was formed in 2003 through the merger of Hitachi and Mitsubishi Electric's semiconductor operations, specializing in microcontrollers, analog, and power devices for industrial and embedded markets.

The H8/3937R Series-including HD6473937RXV-was designed specifically for FLEX protocol-based paging systems requiring roaming capability, low-power operation, and integrated real-time decoding hardware.

FAQ

What is the primary function of the HD6473937RXV in FLEX-based pager systems?

The HD6473937RXV serves as the central microcontroller with integrated hardware FLEX™ decoder, enabling real-time decoding of Motorola FLEX protocol messages. Its roaming-mode logic allows automatic base station reselection, and its dual SCI channels support concurrent host communication and RF modem control-making HD6473937RXV essential for compliant, low-latency pager operation.

Does the HD6473937RXV support in-system programming or firmware updates?

No, the HD6473937RXV contains mask-programmed ROM, meaning firmware is permanently written during manufacturing and cannot be modified post-production. For field-upgradable alternatives, consider the flash-based HD64F3937R variant-but note that HD6473937RXV itself requires pre-programmed ROM images and does not support ISP or bootloader functionality.

What power modes does the HD6473937RXV support, and how do they differ?

The HD6473937RXV supports six distinct power modes: Active, Subactive, Subsleep, Watch, Standby, and Sleep. Each offers progressively lower current draw-from ~15 mA in Active mode down to ≤1.5 µA in Standby-with varying levels of peripheral clock gating and pin-state retention. Wake-up sources include external interrupts, SCI activity, and RTC alarms, all configurable per mode.

Is the HD6473937RXV pin-compatible with other H8/3937 series microcontrollers?

Yes, HD6473937RXV shares the same 100-pin LQFP package and pin assignment with other members of the H8/3937 and H8/3937R families, including HD6473937 and HD64F3937R. This allows PCB layout reuse across variants-though functional differences (e.g., roaming logic, ROM vs. flash) require corresponding firmware and configuration changes.

What is the maximum operating frequency and clock source configuration for the HD6473937RXV?

The HD6473937RXV operates at up to 16 MHz using an external crystal or clock source connected to XTAL/EXTAL pins. It also supports a 32.768 kHz subclock for RTC and low-power wake-up. Internal prescalers allow flexible division of the main clock for peripheral modules, and CLKOUT provides a buffered system clock output for debugging or synchronization.