Chapter 2 Display Functions; Overlapping Obj And Bg - Nintendo GAME BOY Programming Manual

2.4 Overlapping OBJ and BG

When objects are displayed, overlapping objects and background are displayed according to the
display priority flags for OBJ and BG, as indicated below. The BG display priority flag can be
used to assign BG display priority to individual characters.
Display Priority Flag
BG
0:
Use OBJ
Priority
1:
Highest
Priority to BG
(by character)
Note: obj and bg represent dot data (01, 10, 11) for OBJ and BG, respectively.
OBJ OBJ
0: 00
Priority to 00
OBJ obj
obj
1: 00
Priority to 00
BG obj
obj
00
0 00
1 obj
obj
75
Chapter 2: Display Functions
Dot Data
BG Palette
00 BG
bg BG
00 OBJ
bg OBJ
00 BG
bg BG
00 OBJ
bg BG
00 BG
bg BG
00 OBJ
bg BG
Screen Display
Data
00
bg
obj
obj
00
bg
obj
bg
00
bg
obj
bg