Renesas M34508G4HGP#U0

Overview

M34508G4HGP#U0 from Renesas Electronics is a 4-bit single-chip CMOS microcomputer with integrated 4096-word × 10-bit QzROM, 256-word × 4-bit RAM, 10-bit 4-channel A/D converter, dual 8-bit timers (each with two reload registers), serial interface (8-bit × 1), and voltage drop detection circuit. It operates from 1.8 V to 5.5 V and delivers 0.5 µs minimum instruction execution time at 6 MHz - used in low-cost, low-power consumer appliance control systems.

For engineers reviewing the M34508G4HGP#U0 datasheet, M34508G4HGP#U0 pinout, M34508G4HGP#U0 application, or M34508G4HGP#U0 equivalent, this page provides verified functional identity, package mapping (PLSP0020JB-A), validated pin roles, confirmed H-version features (voltage drop detection, power-on reset), and real-world design implications for embedded control selection.

Technical Context

The M34508G4HGP#U0 implements the 4500-series CPU core with a simple, high-speed 4-bit instruction set and executes instructions in as little as 0.5 µs using through-mode clocking at 6 MHz. Its system clock supports multiple sources: on-chip oscillator (RING), external ceramic resonator (XIN/XOUT), or RC network - selected via MR/RG register configuration.

It integrates five interrupt sources (external INT, two timer interrupts, A/D conversion complete, serial interface), one-level subroutine nesting, and eight-level stack depth. The H-version adds dedicated voltage drop detection (reset at typ. 2.6 V) and built-in power-on reset - both absent in non-H variants like M34508G4GP.

Key Specifications

Pinout & Package

Package: PLSP0020JB-A - 20-pin plastic molded SSOP (20P2F-A), 0.65 mm pitch, body size 7.6 × 4.4 mm, suitable for compact PCB layouts in space-constrained consumer modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M34508G4GP#U0, the M34508G4HGP#U0 adds essential power integrity features for unregulated supplies, while uPD78F0503GC-8EU-A trades cost and simplicity for scalability - making M34508G4HGP#U0 optimal for fixed-function, cost-driven appliance control where reliability under voltage fluctuation is critical.

Availability

M34508G4HGP#U0 is available at Aetrix Electronics and suitable for refrigerator control panels, compact air purifiers, smart microwave oven interfaces, and office coffee maker controllers requiring stable component supply across multi-year production cycles.

Supply support for M34508G4HGP#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, and power solutions for automotive, industrial, and consumer markets - founded in 2010 via merger of NEC Electronics and Renesas Technology.

The 4508 Group was designed specifically for cost-sensitive, low-power embedded control in household appliances and consumer electronics - emphasizing integrated peripherals, wide supply range, and robustness in unregulated environments.

FAQ

What is the key functional difference between M34508G4HGP#U0 and M34508G4GP#U0?

The M34508G4HGP#U0 includes a voltage drop detection circuit (reset at typ. 2.6 V) and a built-in power-on reset circuit - both absent in M34508G4GP#U0. These features ensure reliable initialization and brown-out recovery without external components. All other specifications - including ROM/RAM size, timers, A/D, and pinout - are identical between the two parts. The 'H' suffix explicitly denotes this enhanced reset capability.

Does M34508G4HGP#U0 support external crystal oscillation?

No, the M34508G4HGP#U0 does not support external crystal oscillation. It supports three clock sources: on-chip RING oscillator, external ceramic resonator (XIN–XOUT), or RC network (XIN only). The XOUT pin is an output-only node for ceramic resonator feedback; no crystal drive circuitry is implemented. This design choice reduces cost and simplifies layout for target appliance applications.

How many pins on M34508G4HGP#U0 support key-on wakeup functionality?

Twelve pins on the M34508G4HGP#U0 support key-on wakeup: D2, D3, P00, P01, P02, P03, P10, P11, P12, P13, P20, and P21. Each can be individually enabled/disabled via Kx register bits. This allows flexible low-power wake-up from standby mode using push buttons, proximity sensors, or other edge-triggered inputs - critical for battery-operated remote controls and portable appliances.

Can M34508G4HGP#U0 drive LEDs directly, and which pins support this?

Yes, M34508G4HGP#U0 supports direct LED drive on port D (D0–D3), as stated in the official documentation. Each pin can be configured as CMOS output with sufficient sink/source current for standard indicator LEDs. Port D is explicitly designated for LED drive in the device description - eliminating the need for external drivers in status-light applications such as coffee maker readiness indicators or air purifier mode displays.

What is the maximum operating frequency supported by M34508G4HGP#U0?

The M34508G4HGP#U0 achieves a minimum instruction execution time of 0.5 µs at 6 MHz oscillation frequency in through-mode - meaning its maximum effective system clock (f(STCK)) is 6 MHz. Higher frequencies are not supported; attempting to exceed this violates the absolute maximum ratings and may cause timing violations or undefined behavior. The device's clock divider architecture limits usable f(XIN) to 6 MHz for full-speed operation.