D6461 datasheet(35/60 Pages) NEC

35 / 60 page

µPD6461, 6462

3.11 TEST MODE COMMAND

This command is used only to test the IC. Usually, do not input this command. The system cannot enter test mode while

the TEST pin (pin 9) is connected to ground.

(1) For MSB-first transfer (Command bits are input starting from the MSB (D15).)

(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.)

3.12 DISPLAYED CHARACTER CONTROL COMMAND

This command specifies the attributes of each character, including the character pattern, color, and whether it is blinked.

When inputting this command, ensure that LC oscillator is turned on (if the LC oscillator is turned off, it is not possible to

write to video RAM).

This command is a 2-byte continuous command. When continuously writing characters with the same attributes (except

for a pattern), you need input only the eight low-order bits (D0 to D7) of the command for the second and subsequent

characters. In this case, the write column address is automatically incremented (After a character has been written into

column 23, the next character is automatically written into left-most column 0 of the next row. When a character is written

into column 23 of row 11, the next character is automatically written into column 0 of row 0.).

0 → 1 → 2 → • • • • • • • • • • • • → 21 → 22 → 23

Column address (→)

Row n

Row address

Row n+1

( )

Row address incremented

(MSB)

(LSB)

D15

D14

D13

D12

D11

D10

1011000

(LSB)

(MSB)

D10

D11

D12

D13

D14

D15

0001101

D6461 Datasheet(PDF) 35 Page - NEC