UPD6464A データシートの表示（PDF） - NEC => Renesas Technology

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UPD6464A

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

NEC => Renesas Technology 

µPD6464A,6465

2.9 Write Address Control Command

This command specifies a write address when a character is written to the display area (video RAM) of 12

lines by 24 columns. Because this command is a 2-byte command, it must be input in 16-bit units even when

input successively.

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

1

0

0

0

10

0 AR3 AR2 AR1 AR0 AC4 AC3 AC2 AC1 AC0

Write column address control bits

AC4 AC3 AC2 AC1 AC0

Function

0

0

0

0

0

Sets column 0

0

0

0

0

1

Sets column 1

1

0

1

1

1

Sets column 23

Setting prohibited

Write line address 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

• Write column address control bits

One line consists of 24 columns in the horizontal direction. These bits specify the column to be written.

• Write line address control bits

One column consists of 12 lines in the vertical direction. These bits specify the line to be written.

Video RAM configuration

The video RAM consists of 12 lines by 24 columns as shown below.

The number of display characters therefore is 12 lines by 24 columns (when all the lines are set to the

minimum size).

AC4, AC3, AC2, AC1, AC0

AR3, AR2, AR1, AR0

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

00000 00001 00010

10110 10111

19

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