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Luckily, you got the version with internal RAM and ROM and quick programming. If you look at the datasheet you'll see how to program it. You could use a suitably programmed Arduino as a programmer. It has 8k of ROM and takes ~50uS per location to program - that's 2000 bytes per second. If it was a 8752H then it takes 50mS to program a byte so would take 8000/20 or 400 seconds to program.