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MC141585 Datasheet(PDF) 8 Page - Motorola, Inc |
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MC141585 Datasheet(HTML) 8 Page - Motorola, Inc |
8 / 27 page MC141585 8 MOTOROLA - C means column byte. - I means data byte. - In format (c), one dummy data byte(col 31) has to be inserted after the row attribute data byte (col 30) at end of each row, before the first character attribute data byte of the next row. To differentiate the row address for attribute/control regis- ters from display area when transferring data, the most sig- nificant three bits are set to ‘101’ to represent the row address of the attribute/control registers, while ‘00X’ for col- umn address used in format (a) or (b) and ‘01X’ for column address used in format (c). There is some limitation on using mix-formats during a single transmission. It is permissible to change the format from (a) to (b), or from (a) to (c), or from (b) to (a), but not from (c) back to (a) or (b). Figure 7. Data Packet for Attribute/Control Data Figure 8. Address Bit Patterns for Attribute/Control Data MEMORY MANAGEMENT All the internal programmable area can be divided into two parts including (1) Display Registers (2) Attribute/Control Registers. Please refer to the following two figures for the corresponding memory map. Figure 9. Memory Map of Display Registers Internal display RAM are addressed with row and column (coln) number in sequence. As the display area is 15 rows by 30 columns, the related display registers are also 15 by 30. The space between row 0 and coln 0 to row 14 and coln 29 are called Display registers, with each contains a charac- ter/symbol address corresponding to display location on monitor screen. And each register is 8-bit wide to identify the selected character/symbol out of 256 logical selected ROM fonts. Figure 10. Memory Map of Attribute/Control Registers Besides the font selection, there is 3-bit attribute associ- ated with each symbol to identify its color and 3-bit to define its background. Because of 3-bit attribute, each character can select any color out of 8 independently on the same row. as well as background. Every data row associate with one attribute register, which locate at coln 30 of their respective row addr col addr info ADDRESS ROW COLUMN COLUMN X: don’t care D: valid data FORMAT BIT 0 1 2 3 4 5 6 7 D D D D D 1 0 1 D D D D D X 0 0 D D D D D X 1 0 a, b a, b, c c CHARACTER ATTRIBUTE REGISTERS 29 30 0 0 14 WINDOW 1 ~ WINDOW 4 FRAME CRTL REG 15 0 11 12 19 27 28 WINDOW/FRAME CONTROL REGISTERS 31 18 RESERVED 16 0 SPECIAL CONTROL REGISTERS CONFIG 1 HATCH 2 WIND. SHDW COLOR PAGE 34 HOR. DELAY 5 DISPLAY REGISTERS COLUMN 29 0 0 14 27 28 CHARACTER ATTRIBUTE REGISTERS COLUMN 29 30 0 0 14 WINDOW 1 ~ WINDOW 4 FRAME CRTL REG 15 011 12 19 27 28 WINDOW/FRAME CONTROL REGISTERS 31 18 RESERVED 16 0 SPECIAL CONTROL REGISTERS CONFIG 1 HATCH 2 WIND. SHDW COLOR PAGE 3 4 HOR. DELAY 5 |
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