MB90574CPMT-G-446E1

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MB90574CPMT-G-446E1 Application Field and Working Principle

The MB90574CPMT-G-446E1 (hereafter referred to as simply "the processor") is an 8-bit microcontroller designed for embedded applications. It is a member of the MB90574 family of microcontrollers, produced by the Japanese electronics company Matsushita. The processor is suitable for use in a variety of embedded applications including operating systems, real-time systems, automotive and industrial control, calculators and computers, and intelligent video systems.

Processor Overview

The MB90574CPMT-G-446E1 is a low-power, single-chip 8-bit microcontroller. It is based on a high-performance 8 bit Harvard-architecture CPU, the RISC-V ISA-compliant CPMT-G-446E7, and includes an 8 KB ROM, 4 KB RAM, bus controller, UART, timer, 16-channel 12-bit A/D converter, LCD controller, and I/O lines. The processor is pin-compatible with most other 8-bit microcontrollers, making it easy to upgrade or migrate to larger or more powerful applications.

Development Tools

The MB90574CPMT-G-446E1 microcontroller can be programmed using the Renesas Flash Programmer or Renesas e2 Studio development environment. Developer tools such as the Renesas C Compiler are also available for the processor.

System Clock

The processor uses a 24 MHz system clock to provide a maximum operating frequency of 16 MHz. The processor also supports clock rate doubling for higher performance and lower power consumption.

Memory and Bus Architecture

The MB90574CPMT-G-446E1 has an 8 KB ROM, 4 KB RAM, and a bus architecture that supports up to 4 slave ports. The ROM is divided into two banks of 1 KB each, and the 4KB RAM is divided into two banks of 2 KB each, allowing for a dual-port memory access. The processor also includes an LCD controller and several I/O lines.

Interrupts

The MB90574CPMT-G-446E1 uses a prioritized Interrupt Request (IRQ) system based on the following conditions: Software interrupt (NMI), hardware interrupt (IRQ), peripheral interrupt (PINT). The processor supports a total of 64 levels of priority, with up to 16 levels of priority for each of the 3 interrupt types. The processor also supports vectored interrupts, which allow a number of fast interrupts to be serviced simultaneously.

Power Management

The processor supports three distinct low-power modes: halt, standby, and powerdown. In halt mode, the processor continues to execute instructions but at a slower speed. In standby mode, the processor remains in an idle state and can be woken with an interrupt. In powerdown mode, the processor turns off all clocks and powers down the device. The processor also includes a sleep mode where the clocks are stopped and power consumption is reduced significantly.

Timer/Counter

The MB90574CPMT-G-446E1 includes a timer/counter unit (TCU) consisting of four 16-bit timer/counters. These counters are used to measure elapsed time, generate PWM signals, or generate interrupt signals. The TCU can be used to measure the time between external or internal events, or measure the frequency of external signals.

Analog-to-Digital Converter

The processor includes an on-chip 16-channel 12-bit A/D converter. This allows the processor to convert analog signals into digital values. This feature is useful in embedded applications such as measuring temperature, light, or voltage.

Serial Communication

The processor supports a serial communication interface (SCI) which allows the processor to communicate with other devices such as LCDs and other microcontrollers. The processor also supports a UART interface, which allows the processor to communicate with peripheral devices.

Conclusion

The MB90574CPMT-G-446E1 is an 8-bit microcontroller designed for embedded applications. It has an 8 KB ROM, 4 KB RAM, bus controller, UART, timer, 16-channel 12-bit A/D converter, LCD controller, and I/O lines. The processor is suitable for operating systems, real-time systems, automotive and industrial control, calculators and computers, and intelligent video systems. It is also pin-compatible with most other 8-bit microcontrollers, making it easy to upgrade or migrate to larger or more powerful applications.

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