LM1237 National Semiconductor Corporation, LM1237 Datasheet - Page 30

• Manufacturer Part Number: LM1237
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 254 Character Osd And 4 Dacs
• Manufacturer: National Semiconductor Corporation

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Display Page RAM
Control Register Definitions
OSD INTERFACE REGISTERS
Frame Control Register 1
Register Name (address): FRMCTRL1 (0x8400)
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bits 7–5
Data Sent
0xBA
0xBA
0x0A
0x06
0x80
0x00
0x03
0x01
0x08
0x80
0x00
0x05
0x06
0x07
0x08
0x09
0x00
On-Screen Display Enable. The On-Screen Display will be disabled when this bit is a zero. When this bit is a
one the On-Screen Display will be enabled and Display Window 1 will be enabled if Bit 1 of this register is a
one; likewise Display Window 2 will be enabled if Bit 2 of this register is a one.
Display Window 1 Enable. When Bit 0 of this register and this bit are both ones, Display Window 1 is enabled.
If either bit is a zero, then Display Window 1 will be disabled.
Display Window 2 Enable. When Bit 0 of this register and this bit are both ones, Display Window 2 is enabled.
If either bit is a zero, then Display Window 2 will be disabled.
Clear Display Page RAM. Writing a one to this bit will result in setting all of the Display Page RAM values to
zero. This bit is automatically cleared after the operation is complete.
Transparent Disable. When this bit is a zero, a palette color of black (i.e., color palette look-up table value of
0x00) in the first 8 palette look-up table address locations (i.e., ATT0–ATT7) will be interpreted as transparent.
When this bit is a one, the color will be interpreted as black.
Reserved (Should be set to zero)
Chip address (See the Microcontroller Interface Section)
Address LSB
Address MSB
Use Attribute table 0x00 for the following character
Skip 3 lines Command
Row-End (RE) Command
I
I
Chip address (See the Microcontroller Interface Section)
Address LSB
Address MSB
Use Attribute table 0x0A for the following characters
Skip 0 lines Command
Character “D”
Character “E”
Character “F”
Character “G”
Character “H”
Window-End (WE) Command
I
2
2
2
C stop condition (See the Microcontroller Interface Section)
C start condition (See the Microcontroller Interface Section)
C stop condition (See the Microcontroller Interface Section)
(Continued)
TABLE 12. Example 3 I
Description
2
30
C Sequences (Continued)
20023435
RAM Address
0x800C
0x800D
0x800A
0x800B
0x800E
0x8006
0x8007
0x8008
0x8009