UPD6465CS datasheet(24/52 Pages) NEC

24 / 52 page

µPD6464A,6465

3.4

Successive Command Input

Transfer each of the 1-byte, 2-byte, and 2-byte contiguous commands from a microcomputer to the

µPD6464A, 6465 as described below.

When transferring a 1-byte command, 2-byte command, or a 2-byte contiguous command with the blink data

changed after a 2-byte contiguous command has been transferred, either make CS high once, or transfer end

code of the 2-byte contiguous commandNote at the end of the 2-byte contiguous command. In the latter case,

CS needs not to be made high.

Note

7FH (

µPD6464A), FFH (µPD6465)

3.4.1 When 2-byte contiguous command end code is not used

Example 1-byte command

→ 2-byte contiguous command → 1-byte command

CS must be made high once.

1-byte command

1st byte

1-byte command

2nd byte

normal character

Note

2nd byte

normal character

Note

D7 - D0

D15 - D8

D7 - D0

DATA

CLK

2-byte contiguous command

Note

00H-7EH (

µPD6464A), 00H-FEH (µPD6465)

3.4.2 When 2-byte contiguous command end code is used

Example 1-byte command

→ 2-byte contiguous command → 1-byte command

CS needs not to be made high.

1-byte command

1st byte

1-byte command

2nd byte

normal character

Note 1

2nd byte

2-byte contiguous

command end code

Note 2

D7 - D0

D15 - D8

D7 - D0

DATA

CLK

2-byte contiguous command

Notes 1. 00H-7EH (

µPD6464A), 00H-FEH (µPD6465)

2. 7FH (

µPD6464A), FFH (µPD6465)

Remark

Although the CS pin can remain low when the end code of the 2-byte contiguous command is used,

making this pin high is recommended as a countermeasures against noise.

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