The SY-5 is a microcontroller developed by Fujitsu Semiconductor. It is based on a 32-bit CISC core architecture and is used in embedded systems such as motor control, industrial automation, and medical instrumentation. The SY-5 is part of Fujitsu's SY series of microcontrollers and provides a wide range of features, such as on-chip Flash memory, dedicated PWM controllers, and I/O port expansion. The SY-5 also supports a range of communication interfaces, including UART, SPI, and I2C.