ST7070 Ver la hoja de datos (PDF) - Sitronix Technology Co., Ltd.
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ST7070 Datasheet PDF : 51 Pages
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ST7070
Character Generator ROM (CGROM)
The character generator ROM generates 5 x 8 dot character patterns from 9-bit character codes. It can generate
496 5 x 8 dot character patterns. User-defined character patterns are also available by mask-programmed ROM.
Character Generator RAM (CGRAM)
In the character generator RAM, the user can rewrite character patterns by program. For 5 x 8 dots, eight
character patterns can be written.
Write into DDRAM the character codes at the addresses shown as the left column of Table 4 to show the
character patterns stored in CGRAM.
See Table 5 for the relationship between CGRAM addresses and data and display patterns. Areas that are not
used for display can be used as general data RAM.
Timing Generation Circuit
The timing generation circuit generates timing signals for the operation of internal circuits such as
DDRAM, CGROM and CGRAM. RAM read timing for display and internal operation timing by MPU
access are generated separately to avoid interfering with each other. Therefore, when writing data to
DDRAM, for example, there will be no undesirable interference, such as flickering, in areas other than
the display area.
LCD Driver Circuit
LCD Driver circuit has 16 common and 80 segment signals for LCD driving. Data from CGRAM/CGROM is
transferred to 80 bit segment latch serially, and then it is stored to 80 bit shift latch. When each common is
selected by 16 bit common register, segment data also output through segment driver from 80 bit segment latch.
In case of 1-line display mode, COM1 ~ COM8 have 1/8 duty, and in 2-line mode, COM1 ~ COM16 have 1/16
duty ratio.
Cursor Control Circuit
It can generate the cursor in the cursor control circuit. The cursor or the blink appears in the digit at the display
data RAM address set in the address counter.
V1.4
11/51
2009/04/29
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