FEDL9205-03
1
Semiconductor
ML9205-01
Description of Commands and Functions
1. DCRAM data write
(Specifies the addresses 00H to 1FH of DCRAM and writes the character codes of CGROM and CGRAM.)
DCRAM (Data Control RAM) has a 5-bit address to store the character codes of CGROM and CGRAM.
The character code specified by DCRAM is converted to a 5 × 7 dot matrix character pattern via CGROM or
CGRAM.
(The DCRAM can store 24 characters.)
[Command format]
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7
1st byte
(1st)
X0 X1 X2 X3 X4
1
0
0
: selects DCRAM data write mode and specifies DCRAM
address
(Ex: Specifies DCRAM address 00H.)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
2nd byte
(2nd)
: specifies the character codes of CGROM and CGRAM
(written into DCRAM address 00H)
To specify the character code of CGROM and CGRAM continuously to the next address, specify only character
codes as follows.
The addresses of DCRAM are automatically incremented. Specification of an address is unnecessary.
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7
2nd byte
(3rd)
C0 C1 C2 C3 C4 C5 C6 C7 : specifies the character codes of CGROM and CGRAM
(written into DCRAM address 01H)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
2nd byte
(4th)
: specifies the character codes of CGROM and CGRAM
(written into DCRAM address 02H)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7
2nd byte
(25th)
C0 C1 C2 C3 C4 C5 C6 C7 : specifies the character codes of CGROM and CGRAM
(written into DCRAM address 17H)
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