UPD6462GS datasheet(23/60 Pages) NEC

23 / 60 page

µPD6461, 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).)

BL1

BL0

(MSB)

(LSB)

BL1

BL0

Function

Turns off blinking.

Turns on 2 Hz blinking.

Turns on 1 Hz blinking.

Turns on 0.5 Hz blinking.

Blinking control bits

LC oscillation control bit

Function

Turns off LC oscillator.

Turns on LC oscillator.

Function

Turns off character display.

Turns on character display.

Character display on/off control bit

(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.)

•

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.

•

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.

•

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.

(LSB)

(MSB)

BL0

BL1

1000

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