Z86131 datasheet(33/50 Pages) ZILOG

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Z86129/130/131

P R E L I M I N A R Y

NTSC Line 21 Decoder

DS96TEL0200

Z86129 COMMANDS AND REGISTER SUMMARY

Table 15. Z86129 Summary of Control Commands

Cmd.

Name

Cmd. Code

Function

RESET

FBh,FCh,00h

RESET is a three-byte command sequence in SPI or I2C mode. The RESET command

will establish all the specified default settings in the device, but it will not reset the serial

port itself. This sequence can be entered without RDY being set.

NOP

00h

NOP is a one-byte command for use in SPI or I2C mode. The NOP command does not

affect the status of the RDY bit in the Serial Status (SS) register and can be executed

independent of the RDY status.

SSB

FFh,...Fh,FEh

Serial Sync Bytes are used in SPI mode only. This command actually consists of a string

of single-byte commands in the form FFh,....FFh,FEh. SPI mode communications can be

synchronized by sending a synchronizing data string to the part. This string should

consist of at least two SSB bytes of FFh followed by one SSB byte of FEh. At the end of

the FEh byte the port is ready for use

CPTX

10h-1Fh

Selects a Closed Caption (CC1-CC4) or TEXT (T1-T4) data channel for processing or

display

DISP

20h-28h

Selects a preprogrammed XDS screen template for display, with or without 16 Second

Erase timer enabled

RDS1

40h-47h

RDS1 is a one-byte command used to initiate a one byte read sequence by moving the

contents of the register identified by the address field (AD00:02) of the command to the

output register. Addresses 0h-7h are valid in the RDS1 command field AD00:02.

RDS2

60h-66h

RDS2 is a one-byte command which is used to initiate a two-byte read sequence by

moving the contents of the two consecutive registers, starting with the one identified by

the address portion of the command (AD00:AD02), to the output registers and setting the

RD2 bit in the SS register. Only Addresses 0h-6h are valid in the RDS2 command field

AD00:02.

F8h

Command to read one byte in the SPI mode.

F9h

Command to read two bytes in the SPI mode.

WRxx

C0h-DFh, XXh The WRITE commands require two bytes to execute. The first byte is the write command

and includes the Z86129 register address (AD00:04) being written. The second byte (XXh)

will be the data to be written.

Z86131 Datasheet(PDF) 33 Page - Zilog, Inc.

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