ST92185B STMicroelectronics, ST92185B Datasheet - Page 126

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont’d)
SCROLLING
(SCLR)
R248 - Read/Write
Register Page: 32
Reset Value: 0000 0000 (00h)
Bit 7 = SCE: Scrolling Enable
Before enabling scrolling, the scrolling area must
be defined by the FRS[4:0] and LRS[4:0] bits. The
scrolling direction is defined by the UP/D bit.
0: Disable scrolling
1: Enable scrolling
Table 26. Scrolling Control Bits
126/178
SCE
7
DH
0
0
1
FSC
SCE
0
1
0
SS
CONTROL
FRS4
FSC
x
x
x
FRS3
UP/D
LOW
1
0
1
0
x
FRS2
FRS[4:0] LRS[4:0]
REGISTER
FRS1
0
0
x
x
x
FRS0
0
x
x
x
x
x
Bit 6 = FSC: Freeze scrolling
Note: The 2 control bits SCE and FSC must be set
to "1" before enabling the Global double height
(see the DH bit in the SCHR register).
Bit 5 = SS: Scrolling Speed Control bit.
0: The display is shifted by 2 TV lines at each TV
1: The display is shifted by 4 TV lines at each TV
Bit 4:0 = FRS[4:0]: These bits define the upper-
most Row value to be scrolled (rows are num-
bered from 1 to 23). In case of global double height
mode programming, FRS[4:0] must mandatorily
be equal to 00000.
No Global Double Height, No Scrolling
No Global Double Height, Scroll up
No Global Double Height, Scroll down
Global Double Height, No Scrolling, Display top half
Global Double Height, No Scrolling, Display bottom half
frame (i.e. after 2 Vertical sync pulses).
frame.
Meaning