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Renesas M37735EHBFS
- Part No.:
- M37735EHBFS
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
M37735EHBFS.pdf
- Description:
- 16-BIT, UVPROM, MELPS7700 CPU
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
M37735EHBFS from Renesas Electronics is a 16-bit single-chip microcomputer with erasable PROM (windowed ceramic LCC), designed for program development and evaluation. It features 124 KB on-chip PROM, 3968 bytes RAM, 68 I/O pins, 8-channel 10-bit A-D converter, and three UART interfaces - used in office automation control units during firmware prototyping.
For engineers reviewing the M37735EHBFS datasheet, M37735EHBFS pinout, M37735EHBFS application, or M37735EHBFS equivalent, this page delivers verified functional identity, EPROM-mode pin mapping, interrupt priority configuration (7 levels), clock generation architecture (dual built-in circuits), and precise package-level compatibility with 80-pin ceramic LCC (80D0) for UV-erasable development.
Technical Context
The M37735EHBFS implements the 7700 Family CPU core with 16-bit parallel processing capability and optional 8-bit operation mode. Its bus interface unit optimizes memory access efficiency for fast instruction execution, including 103 basic instructions with fastest execution at 160 ns (25 MHz external clock).
It integrates dual clock generating circuits - one for main clock (ceramic resonator or quartz crystal between XIN/XOUT), another for sub-clock (32 kHz oscillator via P76/P77). The device supports EPROM mode entry on RESET low, enabling direct programming/verification as M5M27C101K-equivalent 1M-bit EPROM using dedicated address/data/control pins (P0–P2, P30, P50–P52, CNVSS, BYTE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit 7700 Family CPU with 8-bit mode support and 103 basic instructions |
| PROM Size | 124 Kbytes erasable PROM for firmware development and iterative testing |
| RAM Size | 3968 bytes on-chip RAM for runtime variable storage and stack operations |
| A-D Converter | 10-bit resolution, 8-channel input for analog sensor interfacing in control systems |
| Timer Resources | Five 16-bit TA timers + three 16-bit TB timers for PWM, capture, and interval timing |
| Serial Interfaces | Three UART/clock-synchronous serial I/O modules for peripheral communication |
| Interrupt System | 19 interrupt sources with programmable 7-level priority for real-time event handling |
| Supply Voltage | 5 V ± 10% single supply - compatible with standard TTL/CMOS logic domains |
Pinout & Package
Package: 80-pin ceramic LCC with window (80D0), UV-erasable for development use only. Not recommended for mass production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XIN / XOUT | Main clock oscillator interface | Connect ceramic resonator or quartz crystal; enables internal clock generation at up to 25 MHz |
| P00–P07 | Port P0 I/O or address bus (A0–A7) | In EPROM mode: lower address byte; in single-chip mode: configurable 8-bit bidirectional port |
| P10–P17 | Port P1 I/O or address bus (A8–A15) | In EPROM mode: upper address byte; supports memory expansion addressing |
| P20–P27 | Port P2 I/O or data bus (D0–D7) | In EPROM mode: 8-bit bidirectional data path; matches M5M27C101K pinout |
| P30 | Address bit A16 | Extends EPROM addressing to 1 Mbit (220) range; required for full PROM access |
| P50–P52 | PGM / OE / CE control | Direct EPROM programming signals - P50=PGM, P51=OE, P52=CE per M5M27C101K protocol |
| CNVSS | Processor mode select | Must be tied to VSS for single-chip mode; not used for microprocessor mode selection |
| RESET | Active-low reset input | Forces EPROM mode entry when held low; initiates hardware reset sequence on release |
Key Features
| Feature | Design Value |
|---|---|
| EPROM Development Mode | Full M5M27C101K-equivalent functionality with dedicated address/data/control pins for in-circuit programming |
| Dual Clock Generation | Separate main clock (up to 25 MHz) and sub-clock (32 kHz) circuits enable low-power RTC and high-speed processing |
| Configurable Interrupt Priority | 7-level nesting allows deterministic response to critical events like UART receive or timer overflow |
| Integrated A-D Converter | 8-channel, 10-bit SAR ADC with internal reference (VREF) and AVCC/AVSS isolation for noise-sensitive measurements |
| Memory Expansion Support | Up to 1 Mbyte external memory space via CS0–CS4 chip selects and ALE/WEL/WEH strobes |
| Watchdog Timer | 12-bit watchdog with STP-state recovery control - configurable for fail-safe system restart |
Applications
| Office Automation Control Unit | Industrial Communication Gateway |
|---|---|
Use Scenario: Firmware validation for document scanner motor control and sensor feedback loop. IC Role / Device Role / Timing Role: Central controller executing real-time motion profiles and A/D sampling of paper jam sensors. Use Value: On-chip 10-bit A-D converter and five 16-bit timers eliminate external components for closed-loop servo timing and analog threshold detection. |
Use Scenario: Protocol translation between RS-232 field devices and CAN-based building management network. IC Role / Device Role / Timing Role: UART0/UART1 handle legacy serial comms; UART2 manages CAN physical layer interface timing. Use Value: Three independent UARTs with clock-synchronous mode support enable simultaneous multi-protocol bridging without external transceivers. |
| Programmable Logic Controller (PLC) Trainer | Embedded Test Equipment Interface |
Use Scenario: Educational PLC platform where students load, debug, and erase firmware repeatedly. IC Role / Device Role / Timing Role: Development-targeted microcontroller with UV-erasable PROM and EPROM-mode pin compatibility. Use Value: Windowed ceramic LCC package allows unlimited erase/program cycles using standard EPROM programmers - no soldering required. |
Use Scenario: Calibration fixture that acquires analog sensor outputs and logs data via serial link. IC Role / Device Role / Timing Role: Data acquisition node with synchronized A/D sampling and UART-based host reporting. Use Value: Built-in 8-channel 10-bit A-D converter with programmable trigger (ADTRG on P75) enables precise timestamped measurement bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M37735MHBFS | Same pinout and peripherals but uses mask ROM instead of erasable PROM | Intended for volume production; lacks UV-erasable window and EPROM-mode programming capability | Select M37735MHBFS only for finalized firmware deployments requiring cost-optimized mask ROM |
| UPD78F0503GC-GAH-AX | 16-bit RL78 core, 64 KB flash, 4 KB RAM, 80-pin QFP; no EPROM mode or windowed package | Modern flash-based replacement with debug interface (SWD), higher integration, and RoHS compliance | Choose UPD78F0503GC-GAH-AX for new designs needing production-ready flash, debug support, and lifecycle assurance |
Compared with M37735MHBFS, the M37735EHBFS provides field-erasable firmware iteration via UV exposure, while UPD78F0503GC-GAH-AX offers integrated debugging and flash endurance - making M37735EHBFS uniquely suited for pre-production development where frequent code updates and hardware-in-the-loop validation are essential.
Availability
M37735EHBFS is available at Aetrix Electronics and suitable for office automation control units, industrial communication gateways, and embedded test equipment interfaces requiring stable component supply during prototyping and qualification phases.
Supply support for M37735EHBFS 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 M37735EHBFS belongs to the 7700 Family microcontroller line, designed specifically for cost-sensitive, medium-complexity embedded control applications in commercial and industrial equipment - emphasizing development flexibility via erasable PROM.
FAQ
What is the primary purpose of the M37735EHBFS in product development?
The M37735EHBFS is explicitly intended for program development and evaluation, not mass production. Its windowed ceramic LCC package enables UV erasure of the on-chip PROM, allowing repeated firmware programming and testing. Renesas documentation states "Do not use the windowed EPROM version for mass production, because it is a tool for program development (for evaluation)." This makes M37735EHBFS ideal for lab validation, hardware-software co-design, and pre-release firmware iteration before transitioning to mask-ROM variants like M37735MHBFS.
How does the EPROM mode of the M37735EHBFS work, and which pins are repurposed?
The M37735EHBFS enters EPROM mode automatically when the RESET pin is held low. In this mode, pins P00–P07, P10–P17, P20–P27, P30, P50 (PGM), P51 (OE), P52 (CE), CNVSS, and BYTE function identically to the M5M27C101K EPROM. This enables direct programming and verification using standard EPROM programmers. The device does not support Device Identifier Mode, so users must follow the specified algorithm for programming addresses 01000H–1FFFFH.
What are the key differences between M37735EHBFS and M37735MHBFS?
The M37735EHBFS and M37735MHBFS share identical pinouts, peripherals, and instruction sets, but differ critically in memory type and development support. M37735EHBFS uses erasable PROM and features a UV-transparent ceramic LCC package for firmware reprogramming; M37735MHBFS uses mask ROM and targets final production. Additionally, oscillation register bit 3 behavior and processor mode selection (CNVSS must be VSS-only in M37735EHBFS) differ per Renesas documentation.
Can the M37735EHBFS operate in microprocessor mode, and how is it configured?
No - the M37735EHBFS cannot enter microprocessor mode. Unlike some variants, its CNVSS pin must be connected to VSS to enable single-chip mode operation; connecting CNVSS to VCC (as used for microprocessor mode in other family members) is invalid. Renesas explicitly states: "In the M37735EHBFS, the microprocessor mode cannot be selected by connecting the CNVSS pin to VCC." All operation occurs in single-chip or memory expansion modes only.
What clock sources does the M37735EHBFS support, and how are they configured?
The M37735EHBFS supports two independent clock systems: a main clock (up to 25 MHz) generated via external ceramic resonator or quartz crystal between XIN and XOUT, and a 32 kHz sub-clock generated via XCIN/XCOUT pins (P77/P76). Configuration is controlled by bits in oscillation circuit control registers (addresses 6E₁₆ and 6F₁₆); for example, CC2–CC0 bits select main clock division, and sub-clock external input selection determines whether P76 functions as XCOUT or general I/O.
M37735EHBFS 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:
M37735EHBFS FAQ
1.How can I place an order for M37735EHBFS through Aetrix?
Please submit a Request for Quotation (RFQ) for M37735EHBFS 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 M37735EHBFS reliable?
The price and inventory of M37735EHBFS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M37735EHBFS is usually 5 days.
3.What payment methods are accepted for M37735EHBFS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M37735EHBFS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M37735EHBFS?
M37735EHBFS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M37735EHBFS 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 M37735EHBFS?
For technical support, including M37735EHBFS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M37735EHBFS requirements.
6.How does Aetrix verify that M37735EHBFS is sourced from the original manufacturer or authorized distributors?
All M37735EHBFS 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 M37735EHBFS meets industry standards.
7.What is the process for return or replacement of M37735EHBFS?
All M37735EHBFS units undergo pre-shipment inspection (PSI). If there is an issue with M37735EHBFS, 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 M37735EHBFS part is unused and in its original packaging.
Return procedure for M37735EHBFS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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