UPD6461GS datasheet(38/60 Pages) NEC

38 / 60 page

µPD6461, 6462

4. COMMAND TRANSFER

4.1 1-BYTE COMMANDS

DATA

D7 - D0

DATA

D0 - D7

CLK

MSB first: Input starting from bit D7

LSB first: Input starting from bit D0

4.2 2-BYTE COMMANDS

DATA

D15 - D8

CLK

D7 - D0

DATA

D0 - D7

D8 - D15

First byte

Second byte

First byte

Second byte

MSB first

First byte: D15 to D8

Second byte: D7 to D0

LSB first

First byte: D0 to D7

Second byte: D8 to D15

When inputting a 2-byte command, keep the CS signal low between the first and second bytes of the command.

4.3 2-BYTE CONTINUOUS COMMAND

DATA

D15 - D8

CLK

D7 - D0

DATA

D0 - D7

D8 - D15

D7 - D0

D8 - D15

First byte

Second byte

First byte

Second byte

MSB first

LSB first

The 2-byte continuous command is used to write characters to video RAM. When continuously writing characters for

which the specifications for the color, blinking, reversing, and VC2 channel are the same, transfer the first byte of the first

command then continuously transfer only the second bytes (character pattern addresses) of the commands.

When changing any part of the first byte, end continuous input (by setting the CS signal to high or transferring the end

code for second-byte continuous input) then transfer the newly modified first byte.

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