20X2 pulsout on C port?

[ljg]

Is it possible to use Pulsout on the C port of a 20X2?

I want to use the hardware interrupts and I2C and still control some servos and have run out of pins. The documentation mentions the servo command only works on the B port, but isn't clear to me about the C port and pulsout.

the documentation on Pulsout only mentions 0-7 as pin designations.

Thanks, Larry

 

[westaust55]

With the X2 chips, you have to state the port (by its letter) as well as the pin number


So for port C

Pulsout C.x, 1000

will pulse pin x of port C for the specified duration (in ms).

Be aware that the X2 devices have a default clock speed of 8MHz. You will need to read up whether that influences the duration for X2 devices for the PULSOUT command.

 

[ljg]

thanks for the quick response, and for the reminder on the 8MHz clock speed. I guess that translates as 5µsec units, so I'll make adjustments.

 

[westaust55]

Had a chance to read manuals now.

Picaxe Manual Part 1 page 78 states:

All main PICAXE functions are based upon a 4MHz resonator frequency (8MHz on X2 parts).

From this I understand that the X2 parts will use the same time frame at 8MHz and other PICAXE parts (M, X and X1 ) use at 4MHz.

thus PULSOUT C5, 1000 would still time for 1 second by my understanding.


Test and make sure for yourself.
(I am sure if this is wrong someone will quickly correct)

 

[Technical]

No, please see the pulsout command in part 2 of the manual.

Affect of Increased Clock Speed:​

4MHz 10us unit
8MHz 5us unit​

16MHz 2.5us unit