XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 83

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

LIQUID CRYSTAL DISPLAY DRIVER MODULE
The LCD driver module on the MC68HC05F32 supports 40 frontplanes and 4 backplanes,
allowing a maximum of 160 LCD segments. Each segment is controlled by a corresponding bit in
the LCD RAM. The mode of operation is determined by the values set in the LCD control register
at $1E.
After reset and on leaving standby, the drivers are configured in the default duplex mode, 1/2 bias
with 2 backplanes. At power-up or after reset, the ON/OFF control bits for the internal and external
V
a block diagram of the LCD system. At power-up or after reset the LCD port’s control bits are
cleared, which disables the LCD frontplane drivers.
MC68HC05F32
LCD
voltage (INTVLCD and EXTVON) are cleared, disabling the LCD drivers.
Internal
signals
Internal data bus
Internal address bus
LIQUID CRYSTAL DISPLAY DRIVER MODULE
Control
logic
Figure 8-1 LCD system block diagram
13
FP17
Segment
8
driver
RAM
LCD
8
FP0
Backplane
generator
Voltage
driver
BP3
BP2
BP1
BP0
V
LCD
Figure 8-1
MOTOROLA
shows
TPG
8-1
8