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uPD6461 Datasheet

  • uPD6461

  • OSD LSI

  • NEC   NEC

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PD6461, 6462
3.2 CHARACTER DISPLAY CONTROL COMMAND
This command turns on/off character display, LC oscillation, and the blinking of characters.
(1) For MSB-first transfer (Command bits are input starting from the MSB (D7).)
(MSB)
D7
0
D6
0
D5
0
D4
1
D3
DO
D2
LC
D1
BL1
(LSB)
D0
BL0
BL1
0
0
1
1
Blinking control bits
BL0
Function
0
Turns off blinking.
1
Turns on 2 Hz blinking.
0
Turns on 1 Hz blinking.
1
Turns on 0.5 Hz blinking.
LC oscillation control bit
Function
Turns off LC oscillator.
Turns on LC oscillator.
LC
0
1
Character display on/off control bit
Function
DO
Turns off character display.
0
Turns on character display.
1
(2) For LSB-first transfer (Command bits are input starting from the LSB (D0). The function of each bit is the same as
that for MSB-first transfer.)
(LSB)
D0
BL0
D1
BL1
D2
LC
D3
DO
D4
1
D5
0
D6
0
(MSB)
D7
0
鈥?Blinking control bits
These bits are used to turn on or off the blinking of characters for which blinking has been enabled with the displayed
character control command. The blinking ratio is 1:1, one of three blinking frequencies being selectable for the entire
screen.
鈥?LC oscillation control bit
This bit is used to turn the oscillator on or off. You can stop the oscillator when no character is being displayed,
thus reducing the power consumption.
While the oscillator is stopped, it is not possible to write to video RAM. Turn on the oscillator before attempting
to write to video RAM.
Cautions 1. When using LC oscillation (LC oscillation control bit = 1): When character display is turned on, the
oscillation is synchronized with Hsync, stopping when Hsync goes low. When character display
is turned off, oscillation continues regardless of the state of Hsync.
2. When using an external clock (LC oscillation control bit = 1): While the oscillator is turned on, clock
pulses are supplied to the IC internal circuit. While the oscillator is turned off, no clock pulses are
supplied.
鈥?Character display on/off control bit
This bit is used to turn character display on or off. Character display is turned on or off upon the detection of a
falling edge of Hsync.
23

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