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* The material connection picture of S3F9454/S3F9498 with RT809F ![](https://box.kancloud.cn/9e3ac046661248e50212de2e09a868ee_536x380.png) The connection definition of S3F series with ICSP port board ![](https://box.kancloud.cn/305d41b6700bb430a8c4fb7991452baf_541x361.png) ![](https://box.kancloud.cn/5138eeaaa33b1b2d6da45e2d0004d344_553x224.png) * Recommend : Connect the VPP pin with a 104 tile capacitor to the ground and series connect a Schottky diode on the VDD line,such as 1N5819,SS14 and so on.Connect the positive pole to the ICSP port board,the negative pole to the side of VDD pin of MCU,which can avoid the VPP pin of MCU to break down the VDD pin because of the poor connection of GND ground line. * There is another commonsense problem : Relevant pins of MCU must be connected well with ICSP board,and insert the ICSP board on the programmer then choose corresponding type to read and write.If to insert the ICSP board in the locking socket first and then connect MCU pin,it is easy to burn the MCU. * S3F9454 on line read&write connection definition ![](https://box.kancloud.cn/05e9db089586dedfadd6f7375dc58076_557x382.png) * S3F9498 on line read&write connection definition ![](https://box.kancloud.cn/4578c650a4af502b25cad47bcdfcdbaa_557x347.png) S3F9488 on line read&write connection definition ![](https://box.kancloud.cn/a9971c31d340e99c627db7b0a2fdf29c_512x522.png)