6465 datasheet(21/54 Pages) RENESAS

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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

AR3

AR2

AR1

AR0

AC4

AC3

AC2

AC1

AC0

Write column address control bits

AC4

AC3

AC2

AC1

Function

Sets column 0

Sets column 1

Setting prohibited

AC0

Sets column 23

Write line address control bits

AR3

AR2

AR1

Function

Sets line 0

Sets line 1

Setting prohibited

AR0

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

00000

00001

00010

10110

10111

AR3, AR2, AR1, AR0

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

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