Microchip Technology dsPIC33 - Page 37

 2010-2013 Microchip Technology Inc. DS30009740B-page 37
Liquid Crystal Display (LCD)
Figure 11-1: Example Waveforms and Interrupt Timing in Quarter Duty Cycle Drive
Frame
Boundary
Frame
Boundary
LCD
Interrupt
Occurs
Controller Accesses
Next Frame Data
TFINT
TFWR
TFWR =TFRAME/2 * (LMUX<2:0> + 1) + TCY/2
T
FINT =(TFWR/2 – (2 TCY + 40 ns)) Minimum = 1.5(TFRAME/4) – (2 TCY + 40 ns)
(T
FWR/2 – (1 TCY + 40 ns)) Maximum = 1.5(TFRAME/4) – (1 TCY + 40 ns)
Frame
Boundary
V
3
V
2
V
1
V
0
V
3
V
2
V
1
V
0
V
3
V
2
V
1
V
0
V
3
V
2
V
1
V
0
COM0
COM1
COM2
COM3
2 Frames