Table 4-16. Timing1 Register; Table 4-17. Timing1 Fields; Vertical Timing Panel Control Register (Timing1) - Sharp LH79524 User Manual

Color Liquid Crystal Display Controller

4.5.3.2 Vertical Timing Panel Control Register (TIMING1)

The TIMING1 Register controls the:
• Number of Lines-Per-Panel (LPP)
• Vertical Synchronization Pulse Width (VSW)
• Vertical Front Porch (VFP) period
• Vertical Back Porch (VBP) period
BIT
FIELD
RESET
RW
BIT
FIELD
RESET
RW
ADDR
BIT
31:24
23:16
15:10
4-22

Table 4-16. TIMING1 Register

31 30 29 28
VBP
0 0 0 0
RW RW RW RW RW
15 14 13 12
VSW
0 0 0 0
RW RW RW RW RW
NAME
Vertical Back Porch VBP defines the number of inactive lines at the start of a frame,
after the vertical synchronization period (after the framing pulse, LCDFP, is de-asserted).
The VBP bit field specifies the number of horizontal line-clocks (LCDLP) inserted at the
beginning of each frame. The value in the VBP bit field can generate from 0 to 255
additional line-clock cycles.
VBP
TFT modes: The VBP delay begins after the vertical synchronization signal for the
previous frame (LCDFP) has been deasserted.
STN modes: Program to zero. The vertical back porch is not programmable and always a
duration of zero. Programming any other value other than zero will have no effect.
Vertical Front Porch VFP defines the number of inactive lines at the end of a frame, be-
fore the vertical synchronization period (before the framing pulse, LCDFP, is asserted).
VFP specifies the number of horizontal line-clocks (LCDLP) inserted at the end of each
frame. The value in the VFP bit field can generate from 0 to 255 line-clock cycles.
VFP
TFT modes: The vertical synchronization signal (LCDFP) is asserted after the VFP delay
has expired.
STN modes: Program small value. As higher values are programmed, the contrast of the
display will be reduced.
Vertical Synchronization (Pulse) Width
TFT Modes: VSW is the width of the LCDFP signal. VSW is specified in terms of the number
of horizontal synchronization lines (LCDLP pulses).
VSW
VSW = (LCDLP Periods) – 1
STN modes: Program to 0. The vertical sync pulse width is not programmable and always
a duration of 1 line. Programming any other value than zero will led to unexpected behavior.
27 26 25 24 23
0 0 0 0 0
RW RW RW RW
11 10 9 8 7
0 0 0 0 0
RW RW RW RW
0xFFFF4000 + 0x04

Table 4-17. TIMING1 Fields

DESCRIPTION
Version 1.0
LH79524/LH79525 User's Guide
22 21 20 19 18
VFP
0 0 0 0 0
RW RW RW RW RW
6 5 4 3 2
LPP
0 0 0 0 0
RW RW RW RW RW
17 16
0 0
RW RW
1 0
0 0
RW RW