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參數資料
| 型號： | UPD6464A |
| 廠商： | NEC Corp. |
| 英文描述： | ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR |
| 中文描述： | 屏幕字符顯示的CMOS大規(guī)模集成電路的12線，24柱甲板型錄像機 |
| 文件頁數： | 8/52頁 |
| 文件大?。?/td> | 570K |
| 代理商： | UPD6464A |
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μ
PD6464A,6465
8
1.3 Power-ON Clear Function
Because the internal status of the IC is unstable on power application, initialize the IC by making the PCL
pin high and executing a clear operation. When the clear operation has been performed, the following setting
is made:
Test mode is cleared.
All the character data of the video RAM (12 lines, 24 columns) are set to display OFF data (7E
H
(
μ
PD6464A)/FE
H
(
μ
PD6465)) and the blinking data are set to OFF.
Video RAM write address (line 0, column 0) is set.
Character size is set to
×
1 (minimum) on all lines.
Display is turned OFF and LC oscillation is turned ON.
The time required for the power-ON clear operation can be calculated by the following expression:
t = t
PCLL
Note
+ {video RAM clear time}
= 10 (
μ
s) + {10 (
μ
s) + 12/f
OSC
(MHz)
×
288 [
μ
s]}
Note
Refer to
7. ELECTRICAL SPECIFICATIONS Power-ON Clear Specification
.
Remark
f
OSC
: LC oscillation frequency (dot clock frequency)
2. COMMAND DETAILS
2.1 Video RAM Batch Clear Command
This command can clear the video RAM with a single command.
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
The video RAM batch clear command performs the following setting:
Sets all the character data of the video RAM (12 lines, 24 columns) to display OFF data (7E
H
(
μ
PD6464A)/FE
H
(
μ
PD6465)) and blinking data to OFF.
Sets a video RAM write address (line 0, column 0).
Sets the character size to
×
1 (minimum) on all lines.
Turns display OFF and LC oscillation ON.
The time required for clearing the video RAM can be calculated by the following expression:
t = video RAM clear time
= 10 (
μ
s) + 12/f
OSC
(MHz)
×
288 [
μ
s]
Remark
f
OSC
: LC oscillation frequency (dot clock frequency)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UPD6464ACS | 制造商:NEC 制造商全稱:NEC 功能描述:ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR |
| UPD6464AGT | 制造商:NEC 制造商全稱:NEC 功能描述:ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR |
| UPD6464AGT101A | 制造商:Renesas Electronics 功能描述:VCR 5V Cut Tape |
| UPD6465 | 制造商:NEC 制造商全稱:NEC 功能描述:ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR |
| UPD6465CS | 制造商:NEC 制造商全稱:NEC 功能描述:ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR |
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