User`s manual

104
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. 8.11.39 SPRITE OSD Control Register
b7 b6 b5 b4 b3 b2 b1 b0
SPRITE OSD control register (SC) [Address 0258 16 ]
B Name Functions
After reset
RW
SPRITE OSD Control Register
0 SPRITE OSD
control bit
(SC0)
0RW
b3 b2
0 0: 1Tc ✕ 1/2H
0 1: 1Tc ✕ 1H
1 0: 2Tc ✕ 1H
1 1: 2Tc ✕ 2H
2, 3 Dot size selection
bits
(SC2, SC3)
0RW
4 Interrupt occurrence
position selection bit
(SC4)
0RW
5
0R
1
Pre-divide ratio
selection bit
(SC1)
0: Pre-divide ratio 1
1: Pre-divide ratio 2
0RW
0: Stopped
1: Operating
0: After display of horizontal 20 dots
1: After display of horizontal 10 dots or 20 dots
Notes 1: Tc : Pre-devided clock period for OSD
2: H : H
SYNC
X IN /4096 • SPRITE
interrupt source
switch bit (SC5)
W
6, 7
0R
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0”.
—
0: X
IN /4096 interrupt
1: SPRITE OSD interrupt