UPD6466GS datasheet(51/70 Pages) NEC

51 / 70 page

µPD6466

4.4 Successive Input of Command

Transfer each of the 1-byte, 2-byte, and 2-byte successive commands from a microcontroller to the

µPD6466 as

follows.

To transfer a 1-byte or 2-byte command, or a 2-byte successive command with blinking data changed after a 2-

byte successive command has been transferred, either make CS high once, or transfer FFH (2-byte successive

command end code) at the end of the 2-byte successive command. In the latter case, it is not necessary to make

CS high.

4.4.1 When 2-byte successive command end code is not used

Example 1-byte command

→ 2-byte successive command → 1-byte command

DATA

CLK

Make CS low once and then back high again.

2nd byte

(D0-D7)

MSB first (LSB first)

2nd byte

(D8-D15)

00H-FEH

(normal character)

2-byte successive

command

1st byte

(D0-D7)

1-byte command

(D0-D7)

(D8-D15)

00H-FEH

(normal character)

D7-D0

D15-D8

D7-D0

1-byte command

4.4.2 When 2-byte successive command end code is used

Example 1-byte command

→ 2-byte successive command → 1-byte command

DATA

CLK

1-byte command

2nd byte

(D0-D7)

MSB first (LSB first)

2nd byte

(D8-D15)

00H to FFH

(normal character)

2-byte successive

command

1st byte

(D0-D7)

1-byte command

(D0-D7)

(D8-D15)

FFH (2-byte successive

command end code)

D7-D0

D15-D8

D7-D0

It is not necessary to make CS low and then back high again.

Remark

By using the 2-byte successive command end code, the CS pin may remain low. However, it is

recommended to make CS pin high to improve the noise immunity.

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