Renesas D12321VF25V

Overview

D12321VF25V from Renesas Electronics is a 16-bit single-chip microcomputer in the H8S/2329 Group, featuring an H8S/2000 CPU core, 256 KB on-chip F-ZTAT™ flash memory, 16 KB RAM, and integrated peripherals including TPU, SCI, A/D and D/A converters, WDT, and DMAC - designed for embedded control in industrial automation and motor drive systems.

For engineers reviewing the D12321VF25V datasheet, D12321VF25V pinout, D12321VF25V application, or D12321VF25V equivalent, key selection criteria include flash endurance (≥100 rewrites), 25 MHz max operating frequency, ROM-enabled expansion mode support, and compatibility with H8S/2329B pin-compatible variants in TFP-120 and FP-128B packages.

Technical Context

The D12321VF25V implements the H8S/2000 32-bit internal architecture with 16-bit external data bus, supporting multiple operating modes (Mode 2–7) selected via MD0–MD2 pins. It integrates a 16-bit timer pulse unit (TPU) with 8 channels, asynchronous serial interface (SCI) with programmable baud rates up to 38.4 kbps at 25 MHz, and a 10-bit A/D converter with 8 input channels.

Flash memory programming requires SWE bit setting followed by ≥1 s wait time and PSU bit activation with ≥50 s wait before erase/write; block erase time is 50–1000 ms, and 128-byte programming time is 10–200 ms. The device supports ROM-enabled and ROM-disabled expansion modes with configurable chip select signals CS0–CS7.

Key Specifications

Pinout & Package

Package: TFP-120 (Thin Fine-Pitch Plastic QFP, 120-pin, 14 × 14 mm, 0.4 mm pitch) and FP-128B (Plastic QFP, 128-pin, 14 × 20 mm, 0.4 mm pitch). Pin functions vary by operating mode; key terminals include RES (active-low reset), P20/PO0/TIOCA3 (I/O/timer output), and CS0–CS7 (chip select outputs).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with HD64F2329B, D12321VF25V offers identical functionality and drop-in replacement capability; versus H8S/2328, it provides double flash capacity and added D/A channels - making it essential for applications requiring firmware flexibility and analog actuation.

Availability

D12321VF25V is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controllers, and building automation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for D12321VF25V 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 H8S/2329 Group, including D12321VF25V, was engineered for high-reliability embedded control in factory automation, motion systems, and real-time I/O processing - emphasizing flash reprogrammability, peripheral integration, and deterministic interrupt response.

FAQ

What is the maximum operating frequency supported by the D12321VF25V?

The D12321VF25V supports a maximum operating frequency of 25 MHz, achieved using an external crystal or oscillator connected to the main clock input. This frequency defines the upper limit for instruction execution speed, timer resolution, and serial communication baud rates - all specified in the hardware manual under electrical characteristics at VCC = 5.0 V and TA = –40°C to +85°C. The D12321VF25V must not be operated beyond this rating to ensure functional reliability.

Does the D12321VF25V include on-chip flash memory, and what is its endurance specification?

Yes, the D12321VF25V integrates 256 KB of F-ZTAT™ flash memory. Its guaranteed endurance is ≥100 rewrite cycles, with typical endurance reaching 10,000 cycles at 25°C. Programming requires specific timing sequences: a minimum 1-second wait after SWE bit setting and 50 seconds after PSU bit activation. These constraints are mandatory for reliable firmware updates in the D12321VF25V.

Which package options are available for the D12321VF25V?

The D12321VF25V is offered in two standard packages: TFP-120 (120-pin thin fine-pitch QFP, 14 × 14 mm, 0.4 mm pitch) and FP-128B (128-pin plastic QFP, 14 × 20 mm, 0.4 mm pitch). Both packages share identical pin functions and electrical characteristics; the choice depends on PCB layout constraints and compatibility with existing H8S/2329 footprint designs. Pin arrangements are documented in Figures 1.7 and 1.8 of the hardware manual.

Can the D12321VF25V operate in ROM-enabled expansion mode, and how is it configured?

Yes, the D12321VF25V supports ROM-enabled expansion mode, which maps on-chip flash to the external address space and enables CS0–CS7 outputs for peripheral addressing. Configuration is determined by MD0–MD2 pin states sampled at reset - specifically, Mode 2 (MD2=0, MD1=1, MD0=0) activates this mode. In this configuration, all CSn pins default to input after power-on reset and require DDR and CS167E/CS25E bit setup to become active outputs - a requirement explicitly defined for the D12321VF25V.

What peripheral modules are integrated into the D12321VF25V?

The D12321VF25V integrates a 16-bit timer pulse unit (TPU) with 8 channels, two serial communication interfaces (SCI), a 10-bit A/D converter with 8 input channels, a 8-bit D/A converter with 2 channels, a watchdog timer (WDT), a DMA controller (DMAC), and a data transfer controller (DTC). These peripherals are directly accessible via memory-mapped registers and support autonomous operation - reducing CPU load in time-critical tasks such as PWM generation, sensor acquisition, and serial protocol handling within the D12321VF25V.