UPD6464ACS Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD6464ACS

ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR

NEC => Renesas Technology 

µPD6464A,6465

2.11 Character Size Control Command

This command can set the character size in line units (in both the horizontal and vertical directions).

Because this is a 2-byte command, it must be input in 16-bit units even when successively input.

D15 D14 D13 D12 D11 D10 D9

1001 100

D8 D7

00

D6 D5 D4 D3 D2 D1 D0

S0 0 0 AR3 AR2 AR1 AR0

1

1t dot = fOSC (MHz) µs

fOSC: LC oscillation frequency

Line specification control bits

AR3 AR2 AR1 AR0

Function

0

0

0

0 Sets line 0

0

0

0

1 Sets line 1

1

0

1

Setting Prohibited

1 Sets line 11

Character size control bit

S0

Function

0 Vertical 1 dot: 1H, horizontal 1 dot: 1t dot (minimum size)

1 Vertical 1 dot: 2H, horizontal 1 dot: 2t dots

• Line specification control bits

These bits specify the character size in line units, and control which line is to be specified.

• Character size control bit

This bit selects the character size in two steps.

Display with two character size specified

Example of display screen

External video signal, etc.

Line 0: minimum size (vertical 18H/horizontal 12 dots)

Line 1: 2 times

(vertical 36H/horizontal 24 dots)

Line 2: minimum size

Line 3: 2 times

Line 4: minimum size

Line 5: 2 times

Line 6: 2 times

Line 7: minimum size

Lines 8 to 11 are omitted

because they overflow from the screen.

The size in the vertical direction (the number of horizontal scanning lines) is the size in field units.

21

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