TDA4VM: GPIO at Power-Up

Hello Daviel,

The initial state of the GPIO's can be checked in two places:

1) The GPIO registers in the TRM can show what the state is for some of the GPIO internal configuration like direction, etc.

For example, the direction by default is input on reset.

2) The Pinmux registers also can be used to configure the GPIO state at the output:

The Pinmux is part of the CTRL_MMR Registers in the TRM. You can see the reset default state in the table as well (Pulldown, Pull-up-down Enable).

Please let me know if you need anymore information.

Regards,

Erick

You can see the reset state of each pin in the "Pin Attributes" table in the datasheet. (Section 6-2 / Table 6-1)

BALL RESET STATE: The state of the terminal at power-on reset:
• DRIVE 0 (OFF): The buffer drives VOL (pulldown or pullup resistor not activated).
• DRIVE 1 (OFF): The buffer drives VOH (pulldown or pullup resistor not activated).
• OFF: High-impedance
• PD: High-impedance with an active pulldown resistor
• PU: High-impedance with an active pullup resistor