UPD78F9418

series introduction

# Introduction to the UPD78F9418 Product Series

## 1. Overview
The UPD78F9418 product series is a remarkable line of microcontrollers developed by NEC Electronics (now Renesas Electronics). These microcontrollers are designed to meet the diverse and demanding requirements of a wide range of applications, offering a combination of high - performance, low - power consumption, and rich peripheral features.

## 2. Core and Architecture
### CPU Core
The UPD78F9418 series is based on the 78K0R CPU core. This 8 - bit RISC (Reduced Instruction Set Computing) core provides a high - speed and efficient processing environment. It has a simple and regular instruction set, which allows for fast execution of instructions, enabling the microcontroller to handle complex tasks with ease. The core also features a pipelined architecture, which further enhances the processing speed by overlapping the instruction fetch, decode, and execute stages.

### Memory Architecture
- **Flash Memory**: These microcontrollers are equipped with on - chip flash memory, which provides non - volatile storage for the program code. The flash memory in the UPD78F9418 series offers a large storage capacity, typically ranging from several kilobytes to tens of kilobytes. This allows developers to store complex application programs, and the flash memory can be easily reprogrammed, enabling quick prototyping and product updates.
- **RAM**: A sufficient amount of on - chip RAM is available for data storage during program execution. The RAM provides a fast - access area for variables, buffers, and stack operations, ensuring smooth and efficient program operation.

## 3. Peripheral Features

### Timer Modules
- **General - Purpose Timers**: The UPD78F9418 series includes multiple general - purpose timers. These timers can be used for a variety of applications such as generating accurate time delays, measuring time intervals, and generating pulse - width modulation (PWM) signals. The PWM signals are particularly useful in motor control applications, where they can be used to control the speed and direction of motors.
- **Watchdog Timer**: A watchdog timer is integrated into the microcontroller. This timer acts as a safety mechanism to prevent the system from getting stuck in an infinite loop or malfunctioning. If the program fails to reset the watchdog timer within a specified time period, the watchdog timer will generate a reset signal to restart the system.

### Serial Communication Interfaces
- **UART (Universal Asynchronous Receiver/Transmitter)**: The UART interface allows the microcontroller to communicate with other devices in an asynchronous serial manner. It is commonly used for communication with peripherals such as sensors, displays, and other microcontrollers. The UART interface supports a wide range of baud rates, providing flexibility in different communication scenarios.
- **SPI (Serial Peripheral Interface)**: The SPI interface is a high - speed synchronous serial communication interface. It enables the microcontroller to communicate with external devices such as EEPROMs, ADCs (Analog - to - Digital Converters), and DACs (Digital - to - Analog Converters) in a fast and efficient manner. The SPI interface supports full - duplex communication, allowing for simultaneous data transmission and reception.
- **I²C (Inter - Integrated Circuit)**: The I²C interface is a multi - master, multi - slave serial communication interface. It is widely used for connecting low - speed peripherals such as sensors, real - time clocks, and EEPROMs. The I²C interface uses a simple two - wire bus structure, which simplifies the hardware design and reduces the number of pins required for communication.

### Analog - to - Digital Converter (ADC)
The UPD78F9418 series is equipped with an on - chip ADC. The ADC can convert

Images for reference

80-LQFP

80-TQFP, 80-VQFP

Datasheets

• uPD78(F)9405-07,15-18A

Partlist