sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 745

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

The 1/3, 1/2 and 2/3 VLCD voltage levels are buffered internally with an asymmetric output stage, as
shown in Figure A-5.
The switching matrix applies a capacitive load (LCD elements) to the buffer output. The charge excites the
buffer output voltage V
positive spike on V
After a negative spike on V
behaves like a resistor. Simplified output voltage transients are shown in Figure A-6.. The shown
transients emphasize the spikes and the voltage recovery. They are not to scale. The buffer output
characteristic is shown in Figure A-7.. The resistive output characteristic is also valid if an output is forced
to GND or VLCD.
Freescale Semiconductor
VLCD
Figure A-5. Buffer configuration (left) and buffer output stage (right)
Buf
a frontplane or backplane is discharged by an active load with a constant current.
Buf
from the target output voltage which can be 1/3, 1/2 or 2/3 VLCD. After a
Buf
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
the output is charged through a transistor which is switched on and which
V
Buf
switch
matrix
to LCD
VDDX
output MOSFET
I
active load
out
V
Electrical Characteristics
Buf
745