UPD6464A Просмотр технического описания (PDF) - NEC => Renesas Technology
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UPD6464A
NEC => Renesas Technology
UPD6464A Datasheet PDF : 52 Pages
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µPD6464A,6465
2.2 Display Control Command
This command turns ON/OFF the display and controls LC oscillation and blinking of characters.
D7 D6 D5
0
0
0
D4 D3
1
D0
D2 D1 D0
LC BL1 BL0
Blinking control bits
BL1 BL0
Function
0
0 Blinking OFF
0
1 Blinking frequency: about 2 Hz
1
0 Blinking frequency: about 1 Hz
1
1 Blinking frequency: about 0.5 Hz
LC oscillation control bit
LC
Function
0 LC oscillation OFF
1 LC oscillation ON
Display ON/OFF control bit
D0
Function
0 Display OFF
1 Display ON
• Blinking control bits
These bits blink the character that is specified by the display character control command.
The blinking ratio is 1:1, and three blinking frequencies can be selected.
Blinking in character units can be specified by the display character control command.
• LC oscillation control bit
This bit controls LC oscillation and can turn ON/OFF the oscillation circuit. While no character is displayed,
oscillation can be stopped to reduce the power dissipation.
Data cannot be written to the video RAM with oscillation stopped. To write data to the video RAM, be sure to turn
ON oscillation.
Remark Oscillation is synchronized with Hsync when display is ON and LC oscillation is ON, and oscillation
is stopped while Hsync is low. When display is OFF and LC oscillation is ON, oscillation is performed,
regardless of the level of Hsync.
• Display ON/OFF control bit
This bit turns ON/OFF the display output. The display is turned ON/OFF in synchronization with the fall of Hsync.
9
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