Toshiba T6K04 Handbook page 18

● Status read
(STRD)
D / I / WR DB7 DB6
0 1 B 8 / 6
B (Busy) : When B = "1", the T6K04 is executing an internal operation and no instruction will be accepted
except STRD.
When B = "0", the T6K04 can accept an instruction.
8 / 6 (Word Length) : When 8 / 6 = "1", Word Length of the display data is 8 bits per word.
When 8 / 6 = "0", Word Length of the display data is 6 bits per word.
D (Display) : When D = "1", display ON
When D = "0", display OFF
R (Reset) : When R = "1", the T6K04 is in reset state.
When R = "0", the T6K04 is operating state.
OP (OP−Amp) : When OP = "1", OP−Amp ON
When OP = "0", OP−Amp OFF
Y / X (Counter) : When Y / X = "1", Y counter is selected.
When Y / X = "0", X counter is selected.
U / D (UP / DOWN) : When U / D = "1", X and Y counter are up mode.
When U / D = "0", X and Y counter are down mode.
● Write / read display data
D / I / WR DB7 DB6
1 0 D
1 1 D
The command DAWR writes the display data to the display RAM. The command DARD output the display data
from the display RAM. But, In case of executing data read, the correct data not appear at the first data reading.
Therefore, be careful that the T6K04 needed dummy data read before the data reading.
DB5 DB4 DB3
D R OP
(DAWR / DARD)
DB5 DB4 DB3
D D D D
D D D D
DB2 DB1 DB0
0 Y / X U / D
DB2 DB1 DB0
D D D DAWR: Display Data Write
D D D DARD: Display Data Read
T6K04
2001-03-13 18/30