UPD6465CS datasheet(23/52 Pages) NEC

23 / 52 page

µPD6464A,6465

•

Character specification bits

These bits specify the address of a character. There are 128 types of characters available (

µPD6465: 256 types).

Addresses 7EH (

µPD6464A), FEH (µPD6465), 7FH (µPD6464A) and FFH (µPD6465), however, are fixed to the

display OFF data and 2-byte contiguous command end code, respectively (no character can be set to these

addresses even when the character is changed by mask code option because these addresses are fixed

nevertheless). The character designs can be changed by mask code option.

•

Blink control bit

This bit specifies whether the character written to the video RAM blinks, in character units. For the details of turning

ON/OFF blinking in screen units, refer to 2.2 Display Control Command.

TRANSFERRING COMMANDS

3.1

1-Byte Command

DATA

CLK

3.2

2-Byte Command

DATA

CLK

1st byte

2nd byte

1st byte: D15-D8

2nd byte: D7-D0

When transferring a 2-byte command, keep CS low between the first byte and second byte.

3.3

2-Byte Contiguous Command

DATA

CLK

1st byte

2nd byte

The 2-byte contiguous command writes a character to the video RAM. To write characters in succession

without changing the blink data, first transfer the first byte and then transfer the second bytes (character

addresses) in succession.

UPD6465CS 데이터시트(PDF) 23 Page - NEC