Renesas M34250E2FP

Overview

M34250E2FP from Renesas Technology Corp. is a 4-bit single-chip CMOS microcomputer with mask ROM (2048 × 9 bits) and 64-word × 4-bit RAM, featuring an 8-bit timer with reload register, dual interrupt sources (external INT and Timer 1), and key-on wakeup capability on ports G, S, and INT - deployed in electric household appliances and consumer electronics such as mice.

For engineers reviewing the M34250E2FP datasheet, M34250E2FP pinout, M34250E2FP application, or M34250E2FP equivalent, this page delivers verified technical context, validated pin functions, confirmed operating voltage range (2.2 V to 5.5 V), minimum instruction execution time (1.0 µs at 4.0 MHz), and real-world I/O port behavior including N-channel open-drain structure and software-controllable pull-up/key-on wakeup functions.

Technical Context

The M34250E2FP implements the 720-series CPU core with a 4-bit ALU, 4-level hardware stack, and 1-level interrupt stack (SDP). It executes instructions at 1.0 µs minimum cycle time under 4.0 MHz system clock (VDD = 4.5–5.5 V), supported by internal CR oscillation circuit (±17% frequency error, external R/C required).

Its I/O architecture includes four independent ports: 4-bit port D (D0–D3, with D2/C and D3/K multifunction), 4-bit port S (with logic operation LGOP), 4-bit port G (G0–G3, with G0/INT and G1/TOUT), and 2-bit port F - all using N-channel open-drain outputs with programmable pull-up transistors controlled via PU0 register.

Key Specifications

Pinout & Package

Package: 20-pin plastic molded SOP (20P2N-A), surface-mount, -20 °C to +85 °C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit microcontroller applications.

Compared with M34250M2FP, M34250E2FP offers lower unit cost and higher security for mass production but forfeits field-programmability; versus HD6417250FP, it enables smaller board area and true low-power wake-on-key functionality - critical for handheld and battery-operated applications.

Availability

M34250E2FP is available at Aetrix Electronics and suitable for electric household appliances, consumer electronics mice, and small-appliance timers requiring stable component supply across long-lifecycle industrial programs.

Supply support for M34250E2FP 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 logic devices.

The M34250E2FP belongs to the 4250 Group - a family of cost-optimized 4-bit CMOS microcomputers designed for ultra-low-power, high-reliability applications in consumer and white-goods electronics.

FAQ

What is the maximum system clock frequency supported by the M34250E2FP?

The M34250E2FP supports a maximum system clock frequency of 4.0 MHz, which yields a minimum instruction execution time of 1.0 µs when VDD is 4.5 V to 5.5 V. At lower frequencies (e.g., 1.0 MHz), the device operates down to 2.2 V supply - enabling flexible power/performance trade-offs in battery-powered M34250E2FP deployments.

Does the M34250E2FP include an internal oscillator, or does it require external components?

The M34250E2FP does not include a fully integrated oscillator. It relies on an external CR oscillation circuit: XIN must be pulled up via a resistor and XOUT pulled down via a capacitor. This configuration achieves ±17% frequency accuracy over temperature and voltage - sufficient for non-critical timing in M34250E2FP applications like appliance timers and remote controls.

How many interrupt sources does the M34250E2FP support, and what are their priorities?

The M34250E2FP supports two hardware interrupt sources: external interrupt (INT pin, mapped to G0) and Timer 1 underflow (TOUT pin, mapped to G1). Priority is fixed: external interrupt (priority level 1) takes precedence over Timer 1 interrupt (priority level 2). Both use vectored addressing with dedicated entries in page 1 of ROM (0080H and 0082H).

Can the M34250E2FP retain RAM contents during power-saving mode?

Yes, the M34250E2FP supports RAM back-up mode with only 0.1 µA typical current draw at room temperature. In this mode, all 64 words × 4 bits of RAM retain data while CPU and peripherals halt. Wake-up is triggered by edge detection on INT, TOUT, or CNVSS - making M34250E2FP ideal for intermittent-operation devices like wireless remotes and portable timers.

What I/O port features distinguish the M34250E2FP from generic 4-bit microcontrollers?

The M34250E2FP provides three differentiated I/O capabilities: (1) software-selectable pull-up transistors on ports C, K, G, and S via PU0 register; (2) key-on wakeup on ports G and S plus INT pin - configurable per-pin; (3) logic operation (XOR/OR/AND) between register A and port S contents via LGOP instruction. These features directly enable low-power human-interface designs without external components in M34250E2FP implementations.