Arduino Pro Mini slower than Arduino Nano?
the last days tried tft-display via spi working on arduino pro mini.
after several times of trying , failing, decided test arduino nano.
on nano worked. program tried "graphicstest"-example adafruit-st7735-library, changed absolutely nothing.
after measuring oscilloscope, found out, pro mini slower nano.
both running on 5v , 16 mhz same program, "graphicstest".
the voltage powers both coming same device.
the blue signal signal nano, yellow 1 pro mini.
after switching on voltage, can see on diagram signals generated nano starting earlier. also, not lasting long signals pro mini.
if zoom in, can see "single" pulses longer on pro mini. example: first single pulse nano lasts 8us, first single pulse pro mini lasts 13us.
both china. both have atmega 328p on board.
the pin used in picture measurements pin 10 on both devices. chip-select-pin on tft-display. display wired correctly.
why behave this? , how can change this, because need pro mini.

the url diagram is: https://ibb.co/dbcbpk
after several times of trying , failing, decided test arduino nano.
on nano worked. program tried "graphicstest"-example adafruit-st7735-library, changed absolutely nothing.
after measuring oscilloscope, found out, pro mini slower nano.
both running on 5v , 16 mhz same program, "graphicstest".
the voltage powers both coming same device.
the blue signal signal nano, yellow 1 pro mini.
after switching on voltage, can see on diagram signals generated nano starting earlier. also, not lasting long signals pro mini.
if zoom in, can see "single" pulses longer on pro mini. example: first single pulse nano lasts 8us, first single pulse pro mini lasts 13us.
both china. both have atmega 328p on board.
the pin used in picture measurements pin 10 on both devices. chip-select-pin on tft-display. display wired correctly.
why behave this? , how can change this, because need pro mini.
the url diagram is: https://ibb.co/dbcbpk
verify resonator 16mhz, , system clock prescaler (clkpr) set 1:1.
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