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Priority Order Shifting
From SnesLab
Priority Order Shifting refers to techniques that change which sprites appear on top or behind of other sprites.
While this can be done in software, by moving sprites around in OAM, the SNES contains a hardware feature for priority order shifting - bit 7 of OAMADDH (2103h). When clear, OBJ #0 has the highest priority. When set, the OBJ number specified by bits 1-7 of OAMADDL (2102h) has the highest priority.
References
- page 2-20-2 of Book I of official Super Nintendo development manual