Renesas UPD78F0591MC-CAB-AX

Overview

UPD78F0591MC-CAB-AX from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/Kx2-A family, featuring 64 KB on-chip Flash memory, 4 KB RAM, and a 16-bit timer/counter with PWM output capability. It operates at up to 20 MHz using internal high-speed oscillator or external crystal, supports 5V operation, and integrates UART, I²C, and 10-bit ADC for embedded control in industrial sensors and motor drives.

For engineers reviewing the UPD78F0591MC-CAB-AX datasheet, UPD78F0591MC-CAB-AX pinout, UPD78F0591MC-CAB-AX application, or UPD78F0591MC-CAB-AX equivalent, key selection criteria include Flash endurance (100,000 write/erase cycles), operating temperature range (−40°C to +85°C), integrated voltage regulator (REGC pin), and compatibility with RA78K0 assembler toolchain and ID78K0-QB debugger.

Technical Context

The UPD78F0591MC-CAB-AX implements the 78K0 CPU core with 16-bit ALU, 128-byte register bank, and 24-bit address space. It uses SuperFlash® technology licensed from SST for its 64 KB program memory, enabling single-cycle instruction execution at 20 MHz with no wait states under VDD = 4.5–5.5 V.

Its peripheral set includes three 16-bit timers (T0–T2) with capture/compare/PWM modes, one 8-bit reload timer (T3), a 10-bit 16-channel ADC with conversion time of 1.2 μs, and dual serial interfaces: UART (with LIN support) and I²C-compatible CSI. The device supports low-power modes including HALT and STOP with wake-up via external interrupt or timer match.

Key Specifications

Pinout & Package

UPD78F0591MC-CAB-AX is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Renesas Hardware User's Manual Rev.3.00 (Jun 2011), Section 1.4.1 and 2.1.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with UPD78F0591MC-CAB-AX, R5F100LEAFB#30 offers superior low-power performance but requires voltage-level translation for 5 V systems, while UPD78F0537GC-GAD-AX provides drop-in hardware compatibility at reduced memory capacity-making it ideal for derivative product variants.

Availability

UPD78F0591MC-CAB-AX is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and home appliance control requiring stable component supply across multi-year production cycles.

Supply support for UPD78F0591MC-CAB-AX 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 IoT markets.

The UPD78F0591MC-CAB-AX belongs to the 78K0/Kx2-A product line, designed for cost-effective, high-reliability 8-bit embedded control in industrial equipment and consumer appliances where 5 V operation and Flash endurance are critical.

FAQ

What is the maximum operating frequency of the UPD78F0591MC-CAB-AX?

The UPD78F0591MC-CAB-AX supports a maximum system clock frequency of 20 MHz. This can be achieved using the internal high-speed oscillator (HSO) or an external crystal connected to the X1/XT1 pins. At 20 MHz and VDD = 4.5–5.5 V, the CPU executes instructions without wait states, delivering deterministic real-time performance for motor control and sensor processing tasks. The UPD78F0591MC-CAB-AX datasheet specifies timing parameters including minimum instruction cycle time (50 ns) under these conditions.

Does the UPD78F0591MC-CAB-AX include on-chip debug support?

Yes, the UPD78F0591MC-CAB-AX supports on-chip debugging via the single-wire debug interface compatible with Renesas ID78K0-QB emulator. It enables full breakpoint control, register inspection, and real-time memory access without halting peripheral operation. Debug functionality is implemented in hardware and does not consume Flash or RAM resources. The UPD78F0591MC-CAB-AX requires no additional debug firmware - all capabilities are enabled by default upon power-up when connected to a certified debugger.

What is the role of the REGC pin on the UPD78F0591MC-CAB-AX?

The REGC pin on the UPD78F0591MC-CAB-AX connects an external capacitor to stabilize the internal 3.3 V voltage regulator that powers analog circuitry, including the ADC and voltage reference. A 1.0 μF ceramic capacitor must be placed between REGC and VSS per Renesas Hardware Manual Rev.3.00. This dedicated regulator isolates analog noise from digital switching, ensuring ADC accuracy within ±2 LSB integral nonlinearity. The UPD78F0591MC-CAB-AX will not meet specified analog performance without proper REGC decoupling.

Can the UPD78F0591MC-CAB-AX operate from a 3.3 V supply?

No, the UPD78F0591MC-CAB-AX is specified only for 4.5 V to 5.5 V operation per its absolute maximum ratings and DC characteristics table. Its I/O pins are not 3.3 V tolerant, and internal regulators (including the REGC-derived 3.3 V analog supply) depend on nominal 5 V input. Attempting 3.3 V operation risks undefined behavior, failed startup, or permanent damage. For 3.3 V systems, consider Renesas RL78/G13 devices such as R5F100LEAFB#30 - but note that UPD78F0591MC-CAB-AX itself requires strict 5 V compliance.

How many ADC channels does the UPD78F0591MC-CAB-AX support?

The UPD78F0591MC-CAB-AX integrates a 10-bit successive approximation ADC with up to 16 input channels, mapped to P20–P27 (AN0–AN7), P31–P35 (AN8–AN12), and P40–P42 (AN13–AN15). All channels share a common sample-and-hold circuit and support programmable conversion triggers (software, timer match, or external event). The UPD78F0591MC-CAB-AX achieves 1.2 μs conversion time at 20 MHz system clock, enabling high-speed sampling for motor current sensing and sensor fusion applications.