MTV038 ETC-unknow, MTV038 Datasheet - Page 5

• Manufacturer Part Number: MTV038
• Description: On-screen Display Controller For Crt/lcd Monitor
• Manufacturer: ETC-unknow

the format (c) is applied. Furthermore, the undefined locations in display or fonts RAM should be filled with
dummy data.
There are 2 types of data which should be accessed through the serial data interface, one is ADDRESS bytes
of display registers, and the other is ATTRIBUTE bytes of display registers, the protocols are same for all
except the bit5 of row address and the bit5 of column address. The MSB(b7) is used to distinguish row and
column addresses when transferring data from external controller. The bit6 of column address is used to dif-
ferentiate the column address for format (a), (b) and format (c) respectively. Bit5 of row address for display
register is used to distinguish ADDRESS byte when it is set to "0" and ATTRIBUTE byte when it is set to "1".
And at address bytes, bit5 of column address is the MSB (bit8) and data bytes are the 8 LSB (bit7~bit0)
of display fonts address to save half MCU memory for true 512 fonts display. So each one of the 512 fonts
can be displayed at the same time (see Table 1). And for format (c), since D8 is filled while program column
address of address bytes, the continued data will be the same bank of upper 256 fonts or lower 256 fonts until
program column address of address bytes again.
The data transmission is permitted to change from format (a) to format (b) and (c), or from format (b) to format
(a) and (c), but not from format (c) back to format (a) and (b). The alternation between transmission formats is
configured as the state diagram shown in Figure 3.
Revision 1.1
of Display Reg.
Attribute Bytes
of Display Reg.
Address Bytes
TABLE 1. The Configuration of Transmission Formats
MYSON
TECHNOLOGY
Column
Column
Column
Column
Address
Data
Data
Row
Row
X, X
ab
ab
c
c
FIGURE 3. Transmission State Diagram
DA
D7
D7
b7
1
0
0
1
0
0
c
format (c)
COL
D6
D6
b6
0
0
1
0
0
1
1, X
c
0, X
D8
D8
D5
D5
b5
0
1
x
x
1, X
Initiate
ROW
-5-
R4
C4
C4
D4
R4
C4
C4
D4
b4
R3
C3
C3
D3
R3
C3
C3
D3
b3
COL
format (b)
Input = b7, b6
ab
R2
C2
C2
D2
R2
C2
C2
D2
b2
format (a)
0, 0
DA
R1
C1
C1
D1
R1
C1
C1
D1
b1
ab
1, X
(Revision 1.1)
R0
C0
C0
D0
R0
C0
C0
D0
b0
Format
a,b,c
a,b,c
a,b,c
a,b,c
a,b
a,b
c
c
MTV038
2001/8/21