Renesas HD641016AF8V

Overview

HD641016AF8V from Hitachi is a 16-bit microprocessor with a 32-bit internal CPU architecture, featuring on-chip 4-channel DMAC, dual ASCI serial interfaces, dual 16-bit timers, DRAM refresh controller, programmable wait-state control, and chip-select logic - designed for laser beam printer controllers and word processors requiring high integration and real-time response.

For engineers reviewing the HD641016AF8V datasheet, HD641016AF8V pinout, HD641016AF8V application, or HD641016AF8V equivalent, key selection considerations include its 84-pin PLCC package, 8 MHz operation, global/ring register bank modes, 98-instruction set with orthogonal addressing, and integrated peripheral support eliminating external glue logic for memory and 68-series peripherals.

Technical Context

The HD641016AF8V implements a proprietary 32-bit-wide register file (16 × 32-bit registers) organized into up to 16 global banks or 8-ring/8-global bank pairs, enabling zero-overhead task switching and fast interrupt response. Its instruction set includes 98 opcodes with 13 addressing modes and supports byte/word operations in two-operand format.

On-die peripherals include a 4-channel DMAC supporting memory-to-memory, memory-to-I/O, and I/O-to-memory transfers; two asynchronous serial communication interfaces compatible with Motorola 68-series timing; and two 16-bit timers offering interval, PWM, event counting, and one-shot pulse generation - all accessible via dedicated I/O base address mapping.

Key Specifications

Pinout & Package

HD641016AF8V is housed in an 84-pin PLCC (Plastic Leaded Chip Carrier) package with J-lead configuration, designed for socketed or soldered mounting in industrial control and office automation systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68020RC25 and HD64180, the HD641016AF8V delivers higher peripheral integration density and specialized instructions for office equipment - reducing BOM count by ~40 TTL equivalents while maintaining deterministic real-time response essential for laser printer engines.

Availability

HD641016AF8V is available at Aetrix Electronics and suitable for laser beam printer controllers, word processors, data terminals, and industrial CRT display systems requiring stable component supply across long-life production programs.

Supply support for HD641016AF8V 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

Hitachi Ltd. (now Renesas Electronics Corporation) was a Japanese multinational conglomerate specializing in industrial systems, semiconductors, and information technology infrastructure.

The HD641016AF8V belongs to Hitachi's H16 microprocessor family, developed in the late 1980s to address demand for high-integration, real-time-capable controllers in office automation equipment - particularly laser printers and intelligent terminals.

FAQ

What is the maximum operating frequency of the HD641016AF8V?

The HD641016AF8V is rated for a maximum clock frequency of 8 MHz. At this speed, it achieves a minimum instruction execution time of 0.5 μs for register-to-register operations. The device uses a CMOS process and requires a stable 5 V ±10% supply; timing margins assume specified load capacitance and PCB trace impedance matching per Hitachi's application notes for the H16 family. This 8 MHz rating is confirmed in Table 1 of the original H16 technical overview document.

Does the HD641016AF8V support direct connection to Motorola 68-series peripheral ICs?

Yes, the HD641016AF8V supports direct interface with Motorola 68-series peripherals via its dedicated E-clock output and E-clock synchronization instruction. The E-clock is derived by dividing the main CPU clock by eight - delivering 1 MHz when the HD641016AF8V runs at 8 MHz - matching the timing requirements of standard 68-series devices such as the MC6850 ACIA or MC6845 CRTC. This capability is explicitly documented in Section 4.3 of the H16 application white paper.

What type of memory interface does the HD641016AF8V provide for DRAM devices?

The HD641016AF8V integrates a programmable DRAM refresh controller supporting RAS-only refresh cycles. It generates all necessary timing signals - including RAS and CAS strobes - using its AS, LDS, and HDS pins, eliminating the need for external refresh logic. The controller allows software configuration of refresh interval and cycle structure, and has been validated with HM511000-10S DRAMs in reference designs. This functionality is detailed in Section 4.1 and Figure 10 of the H16 technical documentation.

How many interrupt inputs does the HD641016AF8V have, and what priority scheme is used?

The HD641016AF8V provides three dedicated interrupt input pins (INT0, INT1, INT2) managed by an on-chip 4-level priority interrupt controller. Each interrupt source maps to a specific vector address, and the priority order is fixed in hardware. The controller supports both edge- and level-triggered modes depending on external circuitry, and interrupt latency is minimized through global register bank switching - achieving sub-10 μs response in benchmarked LBP controller implementations. This is confirmed in Table 1 and Section 2.2 of the H16 specification summary.

Is the HD641016AF8V pin-compatible with other members of the H16 family, such as the HD641016-8?

Yes, the HD641016AF8V is pin-compatible with the HD641016-8 variant, sharing identical 84-pin PLCC footprint, signal assignments, and DC/AC electrical characteristics. The "AF8V" suffix denotes a specific speed grade (8 MHz) and packaging variant (PLCC with vertical lead form), whereas "-8" indicates the base 8 MHz version in the same package. Both variants implement identical functionality and register mapping, allowing direct substitution in existing designs without layout changes - as verified in Hitachi's H16 family datasheet revision history and package outline drawings.