MPC5746R TCRCLK loopback and IGF

[jamesmurray]

As I understand it, the eTPU angle-clock input can only come from TCRCLK, not eTPU0 ? These are often on the same physical pin, but require a different mux setting. 576 vs. 512.

If this is correct, then it seems that it is not possible to route PC7 -> IGF -> TCRCLK ?  The input mux spreadsheet only lists physical pads as options for TCRCLK.

Likewise is there any way to "loopback" into the TCRCLK input to drive it and the angle-clock from software e.g. a simulator. I know I could physically connect two processor pins and swap the input mux to that second input, but this seems like a brute force method that I would rather avoid.

James

[jamesmurray]

Any thoughts on the loopback question?

0 pin option (best)

The input muxing spreadsheet lists field SSS=0 as "disable low". Is there a corresponding "disable high" ? If there is, would toggling the mux setting between low and high trigger the TCRCLK?

1 pin option (ok)

If say PC7 was configured as an output, with the input buffer enabled and the mux for TCRCLK (576) set to 1 for PC7, would changing the output state of PC7 trigger the TCRCLK?

2 pin option (wasteful)

This works.. physically connect a GPO pin to the TCRCLK physical pin. Toggling the output pin obviously triggers the TCRCLK.

James