UPD6461 Datasheet, PDF (35/60 Pages) NEC – CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY 12 ROWS x 24 COLUMNS

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).)
(MSB)
(LSB)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
1
0
0
0
T8 T7 T6 T5 T4 T3 T2 T1 T0
(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.)
(LSB)
(MSB)
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
T8
0
0
0
1
1
0
1
T0 T1 T2 T3 T4 T5 T6 T7
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.).
Column address (^→)
Row n
0 ^→ 1 ^→ 2 ^→ • • • • • • • • • • • • ^→ 21 ^→ 22 ^→ 23
Row address ( )
Row address incremented
Row n+1
0 ^→ 1 ^→ 2 ^→ • • • • • • • • • • • • ^→ 21 ^→ 22 ^→ 23
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