參數(shù)資料
型號(hào)： UPD6466GS
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
文件頁數(shù)： 21/70頁
文件大?。?/td> 494K
代理商： UPD6466GS
21
μ
PD6466
2.3 Power-ON Clear Function
Because the internal status of the IC is undefined on power application, execute power-ON clear by lowering the
PCL pin for the duration described below.
Command setting on power-ON clear is as follows:
Clears test mode
Default setting of initial status (Refer to
3.14 Initial Status Setting Command
.)
Clears all character data (12 rows, 24 columns) of video RAM (Display Off Data (FEH)). No data blinks.
Video RAM write address (row 0, digit 0)
Standard size for all rows as character size (SV1, SV0, SH1, SH0) = (0, 0, 0, 0)
All rows specified for output pin selection (OD1, OD0) = (0, 0)
Display OFF, LC oscillation ON, blinking OFF
Display of each channel OFF
No background and framing for all three channels
Blue back OFF
Low-order (0) bank for character address
The time required for power-ON clear can be calculated by the following expression. Do not input any command
during this time.
t (Time required for power-ON clearing) = t
PCLL
Note
+ Video RAM clear time
= 10 (
μ
s) + 10 (
μ
s) + 12/f
OSC
(MHz)
×
288
f
OSC
(MHz): LC oscillation frequency or external input clock frequency
Note
Refer to
Power-ON Clear Specifications
in
6. ELECTRICAL
CHARACTERISTICS
.
To clear the video RAM, the dot clock (OSC
IN
pin) must be input. Be sure to input the clock when the input of an
external clock is selected.
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