User`s manual

110
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Fig. 8.11.48 Bottom Border Control Register 1
Fig. 8.11.49 Bottom Border Control Register 2
b7 b6 b5b4 b3 b2b1 b0
Bottom border control register 1 (BB1) [Address 021D
16 ]
B Name Functions After reset R
W
Bottom Border Control Register 1
0
to
7
Control bits of
bottom border
(BB10 to BB17)
Bottom border position (low-order 8 bits)
T
H ✕
(setting value of low-order 2 bits of BB2 ✕16
2
+ setting value of high-order 4 bits of BB1 ✕16
1
+ setting value of low-order 4 bits of BB1 ✕16
0
)
Indeterminate
RW
Notes 1: Set values fit for the following condition:
(TB1 + TB2 ✕ 16
2
) < (BB1 + BB2 ✕ 16
2
).
2: T
H is cycle of H SYNC .
3: BB2 is bottom border control reigster 2.
b7 b6 b5b4 b3 b2b1 b0
Bottom border control register 2 (BB2) [Address 021F
16 ]
B Name Functions After reset R
W
Bottom Border Control Register 2
0, 1
Control bits of
bottom border
(BB20, BB21)
Bottom border position (high-order 2 bits)
T
H ✕
(setting value of low-order 2 bits of BB2 ✕16
2
+ setting value of high-order 4 bits of BB1 ✕16
1
+ setting value of low-order 4 bits of BB1 ✕16
0
)
Indeterminate
Indeterminate
RW
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are indeterminate.
R —
2
to
7
Notes 1: Set values fit for the following condition:
(TB1 + TB2 ✕ 16
2
) < (BB1 + BB2 ✕ 16
2
).
2: T
H is cycle of H SYNC .
3: BB1 is bottom border control reigster 1.