Reference guide

LCD Driver for LCD Display Panel
Cluster (Dashboard) Using S12HZ256 as a Single-Chip Solution Designer Reference Manual, Rev. 0
Freescale Semiconductor 21
3.6 LCD Driver for LCD Display Panel
The S12HZ256 internal LCD driver module has 32 frontplane drivers and 4 backplane drivers. A
maximum of 128 LCD segments are controllable. Each segment is controlled by a corresponding bit in
the LCD RAM, located at address 0x120–0x137.
Four multiplex modes (1/1, 1/2, 1/3, 1/4 duty) and three bias (1/1, 1/2, 1/3) methods are available. The
voltage generator, connected to the VLCD pin, generates voltage levels for the timing and control logic to
produce the frontplane and backplane waveforms. Please refer to InitLCD project.
Please refer to the firmware project (4. InitLCD2) for more detailed information. See Figure 3-10 and
Figure 3-12.
Figure 3-10. InitLCD2 Screen
Figure 3-11. Turn On All LCD Segments