TMR on SM700

[nicocarv]

Dear Synapse team,

I'm confused, the SM700 has 3 or 4 TMR available? In the SM700 datasheet we have PIN 30 as Timer3 IO signal (or TMR3).
But in the Reference Manual, it is set as a General I/O (they say that TMR3 is used to generate the 1 millisecond time base for SNAP).

I suppose that this last information is the right but I would like a confirmation.
In this case PIN 30 can be used as a general I/O or I should not connect any signal to it?

Thanks for your advice!

Nicolas Carvallo.

[gvoce]

I think the answer can be found in the top of one of the example scripts… (bolding added by me)


MC13224_PWM.py - an example script demonstrating control of the three
available timer (TMR) modules on the MC13224 chip. (There is a fourth TMR
module inside the chip, but it is unavailable for PWM generation because
it is used to provide the 1 millisecond "tick" for the rest of SNAP to use).

So, it technically *IS* TMR3 but you cannot use it

We need to add this to the manual for your convenience

[nicocarv]

Dear Gvoce, Thanks for your reply.

I still would like to know what happens with pin 30. It is still available as a general I/O or I will have the tick signal as an output?

[gvoce]

It can be treated like a GPIO (GPIO_11)