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| 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)： | 22/70頁(yè) |
| 文件大?。?/td> | 494K |
| 代理商： | UPD6466GT |
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22
μ
PD6466
3. DETAILS OF COMMANDS
3.1 Video RAM Batch Clear Command
This command can be used to clear the video RAM with a single command (regardless of whether the MSB or LSB
comes first)
(MSB)
(LSB)
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
The following contents are set by the video RAM batch clear command.
Clears all the character data (Display Off Data (FEH)) of the video RAM (12 rows, 24 columns). No data blinks.
Video RAM write address: (Row 0, column 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
The time required for clearing the video RAM can be calculated by the following expression. Do not input any
command during this time.
t (Time required for video RAM clearing)= Video RAM clear time
= 10 (
μ
s) + 12/f
OSC
(MHz)
×
288
f
OSC
(MHz): LC oscillation frequency or external input clock frequency
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.
Remark
This command resets the hardware of the IC by inputting a signal to the PCL pin. While initializing the
IC including clearing the video RAM and the test mode, the video RAM batch clear command executes
software reset to initialize the IC, and does not clear the test mode.
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