L137 PIN conflict

Angela Qiu

Hello

I want to use L137 in my audio products, I need to use McASP0 and EMAC simultaneously , but I find AHCLKR0 and AXR0[0-8] are conflicted. I want to know if I can use the rest pins of McASP0 such as AXR0[9-15]?

thanks

over 13 years ago

0 Jakez over 13 years ago

Expert 1950 points

Hello,

Yes, function selection is done on a pin-by-pin basis through PINMUX registers.

Jakez

0 Angela Qiu over 13 years ago in reply to Jakez

Prodigy 240 points

Thanks for reply.

If it means that all rest pins of McASP0 still can be McASP function but not only GPIO？

0 Jakez over 13 years ago in reply to Angela Qiu

Expert 1950 points

Hello,

Yes, it means that each pin has its own function, independantly of subsystem usage (MCASP, EMAC, GPIO,...). Pin multiplexing is only an output selection; subsystem activation is done elsewhere. GPIO has no precedence over the other subsystems.

For example:

You may link the pin C6 (UART1_RXD/AXR0[9]/GP3[9]) to the MCASP0 AXR0(9) and the pin D6 (UART1_TXD/AXR0[10]/GP3[10]) to UART1_TXD.

You can then output MCASP0 AXR0(9) data and UART1_TXD data, but UART1_RXD can't be used as input.

You can still use GPIO to read both pins (if it makes any sense).

Jakez

0 Angela Qiu over 13 years ago in reply to Jakez

Prodigy 240 points

thanks

I understand it now.

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L137 PIN conflict