The FR Family FR81S MCUs can be programmed with two serial writers; CAN MCUs can be programmed with one serial writer.
Programming with Flash serial writer using SIO
Programming with PC serial writer using UART Notes:
The frequency of the crystal oscillator that can be specified for each type of microcontroller is limited.
For information on microcontrollers compatible with the PC serial writer, contact Cypress Technical Support.
Programming with Flash serial writer via CAN
When programming with a serial writer (such as Yokogawa Digital Computer Corporation (YDC) products) via CAN to Flash MCU, a boot program (from YDC) needs to be programmed to the Flash MCU; this is also possible using CAN.