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help on explain SPM -6

Hi,

When I read fir16.asm, I do not understand the following lines:

;; SatMax = 0x00FFFFFF (corresponds to SPM of -6)
;; SatMin = 0xFF000000 (corresponds to SPM of -6)

SPM -6 means right shift 6 bits. How does it correspond to "SatMax = 0x00FFFFFF"?

I cannot figure it out. Could you help me on that?

Thanks,