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How about using ST's Discovery board for getting familiar with this MCU: https://www.st.com/st-web-ui/active/en/catalog/tools/PF254044
These boards are pretty cheap (11 $), conatain some sensors, LEDs etc. and the onboard debugger ST-Link.
There's a firmware package available with 28 examples.
You could use a hex2bin converter to find that out. But usually you want to know how much of the available rom size is consumed up by your program.
So better will be forcing your linker to generate a map file. This map file, which is a text file, contains detailed information about the used ram...
Don't mix up hex with bin file format. The hex file format is a text file containing destination address, data, checksum etc.
See here for details: https://en.wikipedia.org/wiki/Intel_HEX
If you convert the hex file to a bin file, which is the real raw data, this would be smaller than 8kB.
It's an AT24C256B in DIP package, sealed 2009, week 34.
See the datasheet ( http://www.atmel.com/dyn/resources/prod_documents/doc5279.pdf ), p. 14 for details
You can also use simple resistor dividers to convert 5V to 3.3V. But this is (same for drivers above) only unidirectional.
For bidirectional communication I'd really suggest to use a 3.3V 8051. Not hard to find.
Maybe you want to read registers or memory from TFT, e.g. for modifying the picture...
How about the P16Pro from the same author. No programmed chip required and the hardware is simple to build.
Btw. the PC software is the same for Picall and P16Pro. There's a Windows and DOS version available.
Using a pull-down with a 89c51 won't work due to the open-collector architecture. Please take a look here: https://www.freewebs.com/maheshwankhede/basic/port.GIF
So this proposal is only useful for PIC or similar. 10k should be OK
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