參數(shù)資料
型號(hào)： UPD6466GT
廠商： NEC Corp.
英文描述： ON-SCREEN CHARACTER DISPLAY CMOS IC FOR 512-CHARACTER, 12-ROW, 24-COLUMN, CAMERA-CONTAINED VCR
中文描述： 屏幕字符顯示的CMOS集成電路512-CHARACTER，12列，24列，攝像機(jī)，錄像機(jī)所載
文件頁(yè)數(shù)： 64/70頁(yè)
文件大?。?/td> 494K
代理商： UPD6466GT
64
μ
PD6466
Command Successive Input Permissible Time
Successively input commands under the following timing conditions:
(T
A
= –20 to +75
°
C, V
DD
= 2.7 to 5.5 V)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Command successive
T1
Common to all commands
2.0
μ
s
input enable time
T2
Video RAM write
Display ON
LC oscillation
Note 1
μ
s
command
External clock
Note 2
Display OFF
2.0+19/f
OSC
μ
s
f
OSC
: LC oscillation or external input clock frequency (MHz)
Notes 1.
(1) 2.0 + (14/f
OSC
)
×
S1 + 19/f
OSC
+ (1/f
OSC
)
×
S2 + t
HWL
(2) 2.0 + (19/f
OSC
)
×
S
S
S1 : Horizontal character size before Hsync
S2 : Horizontal character size before Hsync
t
HWL
: Hsync width
: Character size (
×
1 (MIN.) to
×
4)
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.
2.0 + 31/f
OSC
2.0 + (19/f
OSC
)
×
S
(S = 1)
(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
Hi-Z
T1
T2
Hi-Z
CLK
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