Switch-M*eG PN28xx0K GPIO/IRQメモ

何故かPCA9539のINTではなくフロントのボタンがPCA9545のINT0（割込入力0）にも接続されている

Switch-M8eG PN28080K

led-mode (BTN) --+-- PCA9539 (IO1_7) -> PCA9539 (SDA/SCL) -- RTL8380M (GPIO1/GPIO0)
                 |                      PCA9539 (INT) ------ X (none)
                 |
                 +-- PCA9545 (INT0)  -> PCA9545 (INT) ---+-- RTL8380M (GPIO2)
                                                         |
                                        PCA9555 (INT) ---+

Switch-M24eG PN28240K

led-mode (BTN) --+-- PCA9539 (IO1_7) -> PCA9539 (SDA/SCL) -- RTL8382M (GPIO1/GPIO0)
                 |                      PCA9539 (INT) ------ X (none)
                 |
                 +-- PCA9545 (INT0)  -> PCA9545 (INT) ------ RTL8382M (GPIO2)

                                        PCA9555 (INT) ------ X (none)

Switch-M48eG PN28480K

led-mode (BTN) --+-- PCA9539 (IO1_7) -> PCA9539 (SDA/SCL) -- RTL8393M (GPIO17/GPIO16)
                 |                      PCA9539 (INT) ------ X (none)
                 |
                 +-- PCA9545 (INT0)  -> PCA9545 (INT) ------ RTL8393M (GPIO18)
 
                                        PCA9555 (INT) ------ X (none)