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I looked up the hex file, which is generated for LPC932 and found each data length is in different size. But LPC932 can allow 64 bytes be written to flash each time and by doing that, it can saves time for programming micro processor. So I wonder if there are other reasons not to generate hex file with each data be in maximum size of 64 bytes or the data has to be in different size?
"So I wonder if there are other reasons not to generate hex file with each data be in maximum size of 64 bytes or the data has to be in different size?"
You should also wonder whether the programming software that reads those HEX records buffers up to the 64 bytes and then write a 64-byte page for efficiency.