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TCA6424A: Sequencial read from Configuration Port0 to Configuration Port2

Hirotaka Matsumoto
Guru 27585 points
Part Number: TCA6424A

Hi all

We would like to confirm the method which is sequencial read from Configuration Port0 to Configuration Port2 as the description on the datasheet P26.

Our customer would like to read the data from Configuration Port0 to Configuration Port2 sequencially(in a row).
In this case, as the description "if Input Port 1 is read, the next byte read is Input Port 0" on the datasheet, we have to set command byte = 0x0E(Port2), right? Or 0x8C?
(We are sorry that we could not understand Auto-increment function exactly. Is it used for data from Lower byte to Upper byte?)
If our recognition is not correct, could you let us know?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru 63530 points

    Hello Hirotaka,

    By sending the command bit 0x8E to configuration Port2, you enable the auto increment setting. Whenever a read or write function is done on port2, the slave device’s internal register pointer will increment and the next time you read/write on port2 the next register on the next port (port0).

    If you do not want this to happen, send 0E to configuration port2 and this auto increment setting will not occur. Every time you read or write to port2, the slave device will always read/write the same port.