LM1237 datasheet(30/42 Pages) NSC

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Display Page RAM (Continued)

TABLE 12. Example 3 I

2C Sequences (Continued)

Data Sent

Description

RAM Address

0xBA

Chip address (See the Microcontroller Interface Section)

0x06

Address LSB

0x80

Address MSB

0x00

Use Attribute table 0x00 for the following character

0x03

Skip 3 lines Command

0x8006

0x01

Row-End (RE) Command

0x8007

2C stop condition (See the Microcontroller Interface Section)

2C start condition (See the Microcontroller Interface Section)

0xBA

Chip address (See the Microcontroller Interface Section)

0x08

Address LSB

0x80

Address MSB

0x0A

Use Attribute table 0x0A for the following characters

0x00

Skip 0 lines Command

0x8008

0x05

Character “D”

0x8009

0x06

Character “E”

0x800A

0x07

Character “F”

0x800B

0x08

Character “G”

0x800C

0x09

Character “H”

0x800D

0x00

Window-End (WE) Command

0x800E

2C stop condition (See the Microcontroller Interface Section)

Control Register Definitions

OSD INTERFACE REGISTERS

Frame Control Register 1

20023435

Bit 0

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.

Bit 1

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.

Bit 2

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.

Bit 3

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.

Bit 4

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.

Bits 7–5

Reserved (Should be set to zero)

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