BT856 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

BT856

YCrCb or RGB to NTSC/PAL Digital Video Encoder

Unspecified 

CIRCUIT DESCRIPTION

Software Programming

Bt856/7

Software Programming

A simplified I2C (7-bit subaddress, 100 Kbps) interface is provided for program-

ming the registers. All registers are write-only and are set to zero following a soft-

ware reset. All data transfers and addresses are written MSB first. The LSB for all

subaddresses is zero to indicate a write condition.

Registers can be written if the I2C address 0x88 is received. The device ID can

be read from the IIC DATA pin if the address 0x89 is received. The device ID for

the Bt857 is 0xE0; for the Bt856, it is 0x60. Figure 17 in the PC Board Consider-

ations section illustrates I2C write operations.

CLKX2 and CLKX1 must be applied and stable for IIC communication. Acti-

vating SLEEP or RESET* will disable IIC communication. Following power up,

the IIC DATA pin may be asserted until CLOCK cycles four times.

20

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