UPD6466GS datasheet(64/70 Pages) NEC

64 / 70 page

µPD6466

Command Successive Input Permissible Time

Successively input commands under the following timing conditions:

(TA = –20 to +75

°C, VDD = 2.7 to 5.5 V)

Parameter

Symbol

Conditions

MIN.

TYP.

MAX.

Unit

Command successive

Common to all commands

2.0

µs

input enable time

Video RAM write

Display ON

LC oscillation

Note 1

µs

command

External clock

Note 2

Display OFF

2.0+19/fOSC

µs

fOSC: LC oscillation or external input clock frequency (MHz)

Notes 1.

(1) 2.0 + (14/fOSC)

× S1 + 19/fOSC + (1/fOSC) × S2 + tHWL

(2) 2.0 + (19/fOSC)

× S

: Character size (

×1 (MIN.) to ×4)

S1 : Horizontal character size before Hsync

S2 : Horizontal character size before Hsync

tHWL : Hsync width

Because the clock is not supplied to the internal circuitry during LC oscillation and Hsync, if Hsync is input

while the video RAM write command is executed, the width directly influences the execution time (1).

If Hsync is not input in the middle, the execution time is as (2) above.

Whether (1) or (2) is longer in time depending on the horizontal character size before and after Hsync and

Hsync width is not known. The longer time is the permissible minimum time.

2.0 + 31/fOSC

(S = 1)

2.0 + (19/fOSC)

× S (S = 2, 3, 4)

The restriction of T2 is not applied to the commands other than the video RAM write command if the clock

cycle for control satisfies the specifications.

DATA

Hi-Z

CLK

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