UPD6465CS datasheet(25/52 Pages) NEC

25 / 52 page

µPD6464A,6465

3.5

BUSY Period for Command Input

The BUSY period for command input is distinguished depending on whether a 1-byte, 2-byte, or 2-byte

contiguous command is used.

When inputting 2-byte contiguous command, there are two timings as shown below, (1) Not transferring 2-

byte contiguous command in Vsync period with detecting Vsync and (2) Transferring 2-byte contiguous

command in Vsync period without detecting Vsync.

When inputting commands in succession, observe the following timing:

3.5.1 When inputting 1-byte or 2-byte command

TB1

CLK

Parameter

Symbol

Condition

MIN.

TYP.

MAX.

Unit

Command continuous

TB1

1-byte or 2-byte command

2.0

µs

input enable time 1

3.5.2 When inputting 2-byte contiguous command

(1) Not transferring 2-byte contiguous command in Vsync period with detecting Vsync (command continuous input

enable time 2 = TB2)

CLK

TB1'

TB2

Parameter

Symbol

Condition

MIN.

TYP. MAX. Unit

Command continuous

TB2

2-byte contiguous command

Display ON TB1’ + (21/fOSC)

× S1 + THWL1

µs

input enable time 2

(= video RAM write command)

Display OFF

TB1’ + (21/fOSC)

× S1

Remark

fOSC

: clock frequency of LC oscillation

: character size

THWL1 : Hsync width

TB1’

≥ 2.0

µs

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