Renesas M34509G4HFP#U0

Overview

M34509G4HFP#U0 from Renesas Electronics is a 4-bit single-chip CMOS microcomputer with integrated 4096-word QzROM, 256-word × 4-bit RAM, 10-bit 6-channel A/D converter, dual 8-bit timers (each with two reload registers), serial interface (8-bit × 1), and voltage drop detection circuit - designed for low-power embedded control in consumer appliance front panels.

For engineers reviewing the M34509G4HFP#U0 datasheet, M34509G4HFP#U0 pinout, M34509G4HFP#U0 application, or M34509G4HFP#U0 equivalent, this page delivers verified functional identity, confirmed H-version-specific features (power-on reset, voltage drop detection), exact 24-pin SSOP package mapping, and validated alternative options for cost- or supply-sensitive designs.

Technical Context

The M34509G4HFP#U0 implements the 4500-series CPU core with a 0.5 µs minimum instruction execution time at 6 MHz in through-mode, supporting multiple clock sources: on-chip oscillator (RING), external ceramic resonator (XIN/XOUT), or RC network. Its system clock is programmable via MR/RG registers with eight division modes.

It integrates six I/O ports (D0–D5, P00–P03, P10–P13, P20/P21, P30/P31, CNTR0/CNTR1/INT) with software-selectable N-channel open-drain/CMOS output structure, key-on wakeup (12 pins), and pull-up functions - all co-located with analog inputs (AIN0–AIN5), serial interface (SIN/SOUT/SCK), and timer/event counter pins (CNTR0/CNTR1).

Key Specifications

Pinout & Package

Package: 24-pin plastic molded SSOP (PRSP0024GA-A), 0.65 mm pitch, body size 7.6 mm × 12.8 mm - compatible with standard surface-mount reflow profiles and compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RL78/L12 and HD64F3687, the M34509G4HFP#U0 delivers optimal balance of integrated safety functions (POR, voltage drop detection), ultra-low standby current (0.1 µA), and compact 24-pin SSOP packaging - making it uniquely suited for cost-sensitive, space-constrained, and safety-aware consumer appliance control.

Availability

M34509G4HFP#U0 is available at Aetrix Electronics and suitable for electrical household appliances, consumer electronic products, and office automation equipment requiring stable component supply across extended production lifecycles.

Supply support for M34509G4HFP#U0 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 automotive, industrial, and consumer markets.

The 4509 Group - including M34509G4HFP#U0 - was engineered for ultra-low-power, cost-optimized embedded control in mass-market appliances, emphasizing integration of A/D, timers, serial interface, and safety circuits in minimal pin count.

FAQ

What is the function of the CNVSS pin on the M34509G4HFP#U0?

The CNVSS pin on the M34509G4HFP#U0 serves as the dedicated analog ground reference for the 10-bit A/D converter and internal voltage reference circuitry. It must be externally connected to VSS (digital ground) with low-impedance routing to ensure accurate analog measurements - failure to do so degrades A/D linearity and introduces offset errors in readings from AIN0–AIN5.

Does the M34509G4HFP#U0 support external crystal oscillation?

No, the M34509G4HFP#U0 does not support external quartz crystals. It supports only ceramic resonators (between XIN and XOUT), RC networks (XIN only), or the internal ring oscillator (RING). The absence of crystal drive circuitry means external 1–4 MHz quartz crystals cannot be used - ceramic resonators up to 6 MHz are the highest-frequency external option.

How many independent A/D input channels does the M34509G4HFP#U0 provide?

The M34509G4HFP#U0 provides six independent 10-bit A/D input channels: AIN0 through AIN5. These map directly to physical pins P20, P21, P30, P31, D2, and D3 - all of which retain full I/O functionality when not configured for analog input, enabling flexible mixed-signal design without dedicated analog-only pins.

Is the M34509G4HFP#U0 pin-compatible with non-H versions like M34509G4FP?

Yes, the M34509G4HFP#U0 is physically pin-compatible with M34509G4FP and other members of the 4509 Group in PRSP0024GA-A package. However, the H version adds voltage drop detection and power-on reset circuits - these functions are absent in non-H variants, and their associated RESET behavior differs. Firmware must account for H-version-specific register initialization.

What is the maximum operating frequency supported by the M34509G4HFP#U0?

The M34509G4HFP#U0 supports a maximum external oscillation frequency of 6 MHz (ceramic resonator or RC network) or an internal ring oscillator frequency of 1 MHz. At 6 MHz, the minimum instruction execution time is 0.5 µs in through-mode - higher frequencies are not supported, and exceeding 6 MHz risks timing violation and undefined operation.