Renesas M34508G4GP#U0

Overview

M34508G4GP#U0 from Renesas Electronics is a 4-bit single-chip CMOS microcomputer with 4096 words × 10-bit QzROM, 256 words × 4-bit RAM, 10-bit 4-channel A/D converter, dual 8-bit timers with PWM output, and serial interface (8-bit × 1). It operates from 1.8 V to 5.5 V and supports on-chip oscillator, ceramic resonator, or RC oscillation for clock generation. It is used in consumer appliance control systems requiring low-voltage operation and analog sensing.

For engineers reviewing the M34508G4GP#U0 datasheet, M34508G4GP#U0 pinout, M34508G4GP#U0 application, or M34508G4GP#U0 equivalent, key selection considerations include its 20-pin SSOP (PLSP0020JB-A) package, 0.5 µs minimum instruction execution time at 6 MHz, key-on wakeup capability on 12 pins, LED drive support via Port D, and absence of voltage drop detection or power-on reset circuits (non-H version).

Technical Context

The M34508G4GP#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 at 6 MHz in through-mode. Its system clock is programmable via register MR/RG to select between internal ring oscillator (divided by 2/4/8) or external XIN source (divided by 2/4/8), enabling flexible timing control across operating modes.

It integrates four I/O ports (Port D: 4-bit, Port P0: 4-bit, Port P1: 4-bit, Port P2: 2-bit), each configurable as N-channel open-drain or CMOS output with software-selectable pull-up and key-on wakeup functions. Analog inputs AIN0, AIN1, AIN4, AIN5 are multiplexed onto P20, P21, D2, D3 respectively, and share pins with digital I/O functionality without hardware conflict.

Key Specifications

Pinout & Package

Package: PLSP0020JB-A - 20-pin plastic molded SSOP (0.65 mm pitch), surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0404GC-GAH-AX and M34508G4FP#U0, the M34508G4GP#U0 offers optimal balance of cost, power efficiency, and SSOP packaging for space-constrained consumer control boards - especially where 4-bit processing suffices and thermal dissipation is limited.

Availability

M34508G4GP#U0 is available at Aetrix Electronics and suitable for home appliance control, consumer remote interfaces, and office equipment panels requiring stable component supply and long-term production continuity.

Supply support for M34508G4GP#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 4508 Group microcontrollers were designed specifically for cost-sensitive, low-power embedded control in household appliances and consumer electronics - emphasizing integration of A/D, timers, and I/O with minimal external components.

FAQ

What is the maximum operating frequency supported by the M34508G4GP#U0?

The M34508G4GP#U0 supports an external oscillation frequency up to 6 MHz, achieving a minimum instruction execution time of 0.5 µs in through-mode. Its system clock can be derived from the on-chip ring oscillator (divided by 2/4/8) or external XIN source (divided by 2/4/8), allowing flexible trade-offs between speed and power consumption. The M34508G4GP#U0 does not support frequencies beyond 6 MHz per its electrical specifications.

Does the M34508G4GP#U0 include a voltage drop detection circuit?

No, the M34508G4GP#U0 does not include a voltage drop detection circuit or power-on reset circuit. These features are exclusive to the "H" variant (e.g., M34508G4HGP#U0). The M34508G4GP#U0 relies on its external RESET pin and internal power-on reset behavior tied to VDD ramp rate. Designers must implement external supervision or RC-based reset conditioning for robust startup in the M34508G4GP#U0.

How many analog input channels does the M34508G4GP#U0 support, and which pins are used?

The M34508G4GP#U0 supports four 10-bit analog input channels: AIN0 (P20), AIN1 (P21), AIN4 (D2), and AIN5 (D3). These pins are multiplexed with digital I/O functions and retain full port control when configured for analog use. The A/D converter uses successive approximation architecture and shares CNVSS as its analog ground reference, which must be connected directly to VSS.

Can the M34508G4GP#U0 drive LEDs directly, and which port supports this?

Yes, the M34508G4GP#U0 can drive LEDs directly via Port D (D0–D3), which supports CMOS and N-channel open-drain output configurations. When configured as open-drain, Port D pins sink current to illuminate common-anode LEDs without external transistors. The M34508G4GP#U0 datasheet confirms LED drive capability is enabled by default on Port D, making it ideal for status indicators in space-constrained designs.

What is the difference between M34508G4GP#U0 and M34508G4FP#U0?

The M34508G4GP#U0 and M34508G4FP#U0 share identical electrical specifications, memory sizes, peripherals, and instruction set - both are non-H variants of the 4508 Group with QzROM, 256×4-bit RAM, dual 8-bit timers, and 4-channel A/D. The sole difference is package: M34508G4GP#U0 uses PLSP0020JB-A (20-pin SSOP), while M34508G4FP#U0 uses PRSP0020DA-A (20-pin SOP). Pinout and signal mapping are identical, enabling direct substitution where board layout permits.