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Stack pointer is an 8-bit register, but after initialization the stack pointer points to $01FFh, why?

April 26, 2017initialization pointer Points REGISTER stack

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Stack pointer is an 8-bit register, but after initialization the stack pointer points to $01FFh, why?

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CPU will automatically extend a 9th bit for the stack pointer register and the related bit value in the register always displays 1. Therefore, in the CPU, SP is formed after the stack pointer register has extended the 9th bit.