Hi Junya san,
Thank you for contacting Cypress Semiconductor.
I would like to inform you that in this specific case, 0xF0 will be mistakenly treated as data and will be programmed to a memory location. For resetting the device during program operation, reset command can be sent only till before sending the Program (0xA0) command. After the Program command has been sent, Reset command (0xF0) will be treated as data.