µC/GUI LCD7920 Driver
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LCD7920 Driver
Supported controllers
This driver has been tested with the following LCD controllers:
- Sitronix ST7920 controller
Bits per pixel
The supported color depth is 1 bpp.
Interfaces
The driver supports 8-bit parallel (simple bus) interface, or 3 line SPI.
Display data RAM organization
The picture above shows the relation between the display memory and the SEG and COM lines of the display.
Additional RAM requirements of the driver
This LCD driver may be used with or without a display data cache, containing a complete
copy of the contents of the LCD data RAM. If a cache is not used, there are no
additional RAM requirements.
It is recommended to use this driver with a data cache for faster LCD-access. The
amount of memory used by the cache may be calculated as follows:
Size of RAM (in bytes) = (LCD_XSIZE + 7) / 8 * LCD_YSIZE
Additional driver functions
None.
Hardware configuration
This driver accesses the hardware with a simple bus interface. The following table lists the macros which must be defined for hardware access:
| Macro |
Description |
| LCD_INIT_CONTROLLER |
Initialization sequence for the LCD controller. |
| LCD_READ_A0 |
Reads a word from display controller with A-line low. |
| LCD_READ_A1 |
Reads a word from display controller with A-line high. |
| LCD_WRITEM_A1 |
Writes multiple words to display controller with A-line high. |
| LCD_WRITE_A0 |
Writes a word to display controller with A-line low. |
| LCD_WRITE_A1 |
Writes a word to display controller with A-line high. |
Additional configuration switches
None.
Special requirements for certain LCD controllers
None.
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