UPD6462 NEC, UPD6462 Datasheet - Page 23

• Manufacturer Part Number: UPD6462
• Description: CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY 12 ROWS x 24 COLUMNS
• Manufacturer: NEC

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