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Renesas M37477E8SP
- Part No.:
- M37477E8SP
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
M37477E8SP.pdf
- Description:
- 8-BIT, OTPROM, 8MHZ
- Quantity:
- Payment:
- Shipping:
Inventory:355
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Product details
Overview
M37477E8SP from Renesas Electronics is an 8-bit CMOS microcontroller in the 7477 Group, featuring 16 KB on-chip PROM, 384 bytes RAM, four 8-bit timers, and a 4-channel 8-bit A/D converter. It operates at up to 8 MHz with 0.5 µs minimum instruction cycle time and supports 18 programmable I/O pins (P0–P1, P4) and 8 input-only pins (P2–P3), targeting embedded control in consumer audio-visual equipment and office automation devices.
For engineers reviewing the M37477E8SP datasheet, M37477E8SP pinout, M37477E8SP application, or M37477E8SP equivalent, key selection considerations include its 32-pin SOP package (32P2W-A), built-in clock generating circuit with ceramic/quartz oscillator support, 2.7–5.5 V supply range, and interrupt architecture with 13 sources and 11 vectors - all critical for low-cost, single-chip system integration.
Technical Context
The M37477E8SP implements a standard 740-family CPU core with 71 machine-language instructions, including MUL, DIV, WIT, and STP (but excluding FST and SLW). Its memory map integrates 16 KB PROM, 384 bytes RAM, and SFRs-including dedicated registers for timer mode control, A/D conversion, serial I/O status, and edge-polarity-selectable interrupts.
It features dual clock domains: main clock (XIN/XOUT, up to 8 MHz) and optional sub-clock (XCIN/XCOUT, not used in 7477 Group), with CPU mode register (00FB16) controlling stack page and clock source selection. Power-down modes are enabled via STP/WIT instructions, supporting key-on-wake-up from P0 pins when INT1 is configured accordingly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 740-family 8-bit architecture with 71 instructions; enables legacy code reuse and deterministic timing. |
| ROM/PROM Size | 16,384 bytes; sufficient for medium-complexity firmware without external memory. |
| RAM Size | 384 bytes; supports stack depth up to 192 levels and real-time data buffering. |
| Max Clock Frequency | 8 MHz; yields 0.5 µs minimum instruction execution time for responsive control loops. |
| A/D Converter | 4-channel 8-bit; suitable for analog sensor interfacing (e.g., temperature, potentiometer) in cost-sensitive systems. |
| I/O Pins | 18 programmable I/O (P0, P1, P4) + 8 input-only (P2, P3); simplifies peripheral interface without external glue logic. |
| Interrupt Sources | 13 total (5 external, 7 internal, 1 software); enables event-driven operation with priority-based vectoring. |
| Supply Voltage | 2.7–4.5 V (at ≤2.0 MHz) or 4.5–5.5 V (at 8 MHz); supports battery and regulated rail operation. |
Pinout & Package
Package: 32-pin plastic molded SOP (Outline 32P2W-A), RoHS-compliant, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00–P07 | 8-bit bidirectional I/O port | CMOS output structure; pull-up configurable per bit; supports wake-up on "L" level during power-down. |
| P10–P17 | 8-bit bidirectional I/O port | CMOS output; P12/P13 double as T0/T1 timer outputs; P14–P17 double as UART/SCLK/SRDY. |
| P20–P23 | 4-bit input port / A/D inputs IN0–IN3 | Analog input capable; shares pins with P2; requires VREF reference for A/D conversion. |
| P30–P33 | 4-bit input port | P30/P31 double as INT0/INT1; P32/P33 double as CNTR0/CNTR1 timer inputs. |
| P40–P41 | 2-bit bidirectional I/O port | CMOS output; pull-up configurable per 4-bit group; expands general-purpose interface. |
| XIN / XOUT | Main clock oscillator interface | Connects external quartz or ceramic resonator; internal feedback resistor enables self-contained clock generation. |
| RESET | Active-low reset input | Requires ≥2 µs low pulse under normal VCC; initiates hardware reset sequence and vector fetch from FFFF16. |
| VCC / VSS | Power supply / ground | Operates across 2.7–5.5 V; VSS serves as analog and digital ground reference for A/D and logic. |
| VREF | Analog reference voltage input | Defines full-scale A/D conversion range; must be stable and decoupled for accurate 8-bit results. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip PROM programming | One-time electrically writable PROM eliminates mask ROM NRE costs and enables post-manufacturing firmware tuning. |
| Integrated clock generator | Built-in feedback resistor allows direct connection of ceramic or quartz oscillator - no external components required for basic timing. |
| Power-down wake-up capability | Configurable key-on-wake-up from P0 pins reduces system standby current while retaining responsive restart. |
| Dual interrupt polarity control | Edge-polarity selection register (00D416) lets INT0/INT1 trigger on rising or falling edges - adaptable to diverse switch/sensor interfaces. |
| Zero-page and special-page addressing | Optimized memory access modes reduce instruction cycles for frequently used RAM and SFR locations - improves real-time ISR latency. |
Applications
| Audio-Visual Remote Control Unit | VCR System Controller |
|---|---|
Use Scenario: Decoding infrared commands and managing tape transport, head switching, and display functions in compact VCR designs. IC Role / Device Role / Timing Role: Primary system controller executing real-time motor control, IR protocol parsing, and UI state management. Use Value: Integrated 4-channel A/D reads front-panel potentiometers; UART handles IR receive; 18 I/O pins drive LEDs, relays, and motor drivers without external expanders. | Use Scenario: Coordinating tuner, video processor, and mechanical subsystems in analog video cassette recorders. IC Role / Device Role / Timing Role: Central microcontroller managing timing-critical servo loops, tape speed regulation, and error correction logic. Use Value: Four independent 8-bit timers generate precise PWM for capstan motor control; 8 MHz operation ensures sub-millisecond response to tape tension sensors. |
| Office Automation Keypad Interface | Tuner Microcontroller Subsystem |
Use Scenario: Scanning matrix keypads and driving alphanumeric LCDs in fax machines or multifunction printers. IC Role / Device Role / Timing Role: Dedicated keypad/LCD manager offloading main CPU and reducing BOM count. Use Value: P0–P1 ports directly scan 8×4 key matrix; P4 drives static LCD segments; built-in pull-ups eliminate external resistors. | Use Scenario: Frequency synthesis, channel selection, and IF signal conditioning in AM/FM broadcast tuners. IC Role / Device Role / Timing Role: Tuner subsystem controller handling PLL lock detection, band switching, and RSSI monitoring. Use Value: 4-channel A/D digitizes RSSI and AGC voltages; UART communicates with host MCU; 32P2W-A package fits tight tuner module footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M37477M8SP | Mask ROM version (16 KB ROM, 384 B RAM); no in-system programmability. | Suitable only for high-volume, fixed-firmware deployments where reprogramming is unnecessary. | Select M37477M8SP if firmware is finalized and cost-per-unit optimization outweighs flexibility needs. |
| M37478E8SP | 7478 Group variant: adds P5 port (4-bit input), 8-channel A/D, and 20 I/O pins; same package and core. | Required when additional analog inputs or I/O expansion is needed beyond M37477E8SP's 4-channel A/D and 18 I/O limit. | Choose M37478E8SP for upgraded peripheral count while maintaining pin compatibility and toolchain continuity. |
Compared with M37477M8SP, the M37477E8SP offers field-programmable PROM for prototyping and revisions; compared with M37478E8SP, it trades 4 extra A/D channels and 2 I/O pins for lower gate count and cost in simpler applications.
Availability
M37477E8SP is available at Aetrix Electronics and suitable for audio-visual equipment, office automation devices, and consumer remote control systems requiring stable component supply and long-term manufacturability.
Supply support for M37477E8SP 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.
The 7477 Group - including M37477E8SP - was designed for cost-sensitive, single-chip embedded control in consumer electronics, emphasizing integrated peripherals, low-power operation, and ease of programming via unified memory mapping.
FAQ
What is the maximum operating frequency of the M37477E8SP?
The M37477E8SP supports a maximum oscillation frequency of 8 MHz, delivering a minimum instruction execution time of 0.5 µs. This timing assumes use of the main clock circuit (XIN/XOUT) with a quartz or ceramic resonator; operation above 2.0 MHz requires VCC ≥ 4.5 V per the device's absolute maximum ratings.
Does the M37477E8SP include an internal clock oscillator circuit?
Yes, the M37477E8SP includes a built-in clock generating circuit with an internal feedback resistor. This allows direct connection of a ceramic or quartz crystal between XIN and XOUT pins - no external resistor is needed. The M37477E8SP does not support the XCIN/XCOUT sub-clock function, as that is exclusive to the 7478 Group.
How many analog-to-digital converter channels does the M37477E8SP support?
The M37477E8SP supports exactly four 8-bit A/D converter channels, mapped to input pins P20–P23 (IN0–IN3). These share physical pins with Port P2 and require a stable VREF voltage applied to the dedicated VREF pin for accurate conversion across the full 0–VREF range.
What package type is used for the M37477E8SP?
The M37477E8SP uses the 32-pin plastic molded SOP package (Outline 32P2W-A), a surface-mount, gull-wing leaded package with 0.8 mm lead pitch. This package is distinct from the 32P4B DIP variant and is RoHS-compliant, intended for automated PCB assembly in space-constrained consumer modules.
Can the M37477E8SP be programmed after soldering to the board?
No - the M37477E8SP contains one-time programmable (OTP) PROM. Programming must occur prior to board assembly using a compatible PROM programmer and appropriate socket or gang programmer. Once programmed, the memory contents are permanent and cannot be erased or rewritten in-system.
M37477E8SP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
M37477E8SP FAQ
1.How can I place an order for M37477E8SP through Aetrix?
Please submit a Request for Quotation (RFQ) for M37477E8SP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M37477E8SP reliable?
The price and inventory of M37477E8SP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M37477E8SP is usually 5 days.
3.What payment methods are accepted for M37477E8SP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M37477E8SP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M37477E8SP?
M37477E8SP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M37477E8SP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M37477E8SP?
For technical support, including M37477E8SP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M37477E8SP requirements.
6.How does Aetrix verify that M37477E8SP is sourced from the original manufacturer or authorized distributors?
All M37477E8SP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M37477E8SP meets industry standards.
7.What is the process for return or replacement of M37477E8SP?
All M37477E8SP units undergo pre-shipment inspection (PSI). If there is an issue with M37477E8SP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M37477E8SP part is unused and in its original packaging.
Return procedure for M37477E8SP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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