Rev. 1.00
188
September 11, 2018
Rev. 1.00
189
September 11, 2018
HT45F4050
A/D NFC Flash MCU
HT45F4050
A/D NFC Flash MCU
SCOM Controlled LCD Driver
The device has the capability of driving external LCD panels. The common pins, SCOM0~SCOM3,
for LCD driving are pin shared with certain pins on the
I/O
port
s. The LCD signals (COM) are
generated using the application program.
LCD Operation
An external LCD panel can be driven using this device by configuring the I/O pins as common pins.
The LCD driver function is controlled using the SCOMC register which in addition to controlling
the overall on/off function also controls the R-type bias current on the SCOMn pins. This enables
the LCD COM driver to generate the necessary voltage levels, V
SS
, V
DD
/2 and V
DD
, for LCD 1/2 bias
operation.
The SCOMEN bit in the SCOMC register is the overall master control for the LCD driver. The
SCOMn pin is selected to be used for LCD driving by the corresponding pin-shared function
selection bits. Note that the corresponding Port Control register does not need to first setup the pins
as outputs to enable the LCD driver operation.
V
DD
V
DD
/2
SCOMEN
ISEL[1:0]
SCOMn
Pin-shared
Selection
Software Controlled LCD Driver Structure