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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
912 of 1441
NXP Semiconductors
UM10503
Chapter 29: LPC43xx/LPC43Sxx LCD
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PCD = 5 (LCDCLK / 7)
If enough time is given at the start of the line, for example, setting HSW = 6, HBP = 10,
data does not corrupt for PCD = 4, the minimum value.
29.6.2 Vertical Timing register
The TIMV register controls the Vertical Synchronization pulse Width (VSW), the Vertical
Front Porch (VFP) period, the Vertical Back Porch (VBP) period, and the Lines-Per-Panel
(LPP).
29.6.3 Clock and Signal Polarity register
The POL register controls various details of clock timing and signal polarity.
Table 674. Vertical Timing register (TIMV, address 0x4000 8004) bit description
Bit
Symbol
Description
Reset
value
9:0
LPP
Lines per panel.
This is the number of active lines per screen. The LPP field specifies
the total number of lines or rows on the LCD panel being controlled.
LPP is a 10-bit value allowing between 1 and 1024 lines. Program
the register with the number of lines per LCD panel, minus 1. For
dual panel displays, program the register with the number of lines on
each of the upper and lower panels.
0x0
15:10
VSW
Vertical synchronization pulse width.
This is the number of horizontal synchronization lines. The 6-bit VSW
field specifies the pulse width of the vertical synchronization pulse.
Program the register with the number of lines required, minus one.
The number of horizontal synchronization lines must be small (for
example, program to zero) for passive STN LCDs. The higher the
value the worse the contrast on STN LCDs.
0x0
23:16
VFP
Vertical front porch.
This is the number of inactive lines at the end of a frame, before the
vertical synchronization period. The 8-bit VFP field specifies the
number of line clocks to insert at the end of each frame. When a
complete frame of pixels is transmitted to the LCD display, the value
in VFP is used to count the number of line clock periods to wait.
After the count has elapsed, the vertical synchronization signal,
LCDFP, is asserted in active mode, or extra line clocks are inserted
as specified by the VSW bit-field in passive mode. VFP generates
0–255 line clock cycles. Program to zero on passive displays for
improved contrast.
0x0
31:24
VBP
Vertical back porch.
This is the number of inactive lines at the start of a frame, after the
vertical synchronization period. The 8-bit VBP field specifies the
number of line clocks inserted at the beginning of each frame. The
VBP count starts immediately after the vertical synchronization signal
for the previous frame has been negated for active mode, or the extra
line clocks have been inserted as specified by the VSW bit field in
passive mode. After this has occurred, the count value in VBP sets
the number of line clock periods inserted before the next frame. VBP
generates 0–255 extra line clock cycles. Program to zero on passive
displays for improved contrast.
0x0