Table of Contents
Advertisement
18.3.4
Display Period Control
There are two display period control functions:
• Vertical display period control
• Horizontal display period control
These functions enable horizontal blanking and vertical blanking to be controlled.
■ Vertical Display Period Control
Vertical display period control is used to generate vertical display periods for controlling the
output of display signals. In a vertical display period, signals for display in vertical directions are
output. Vertical display periods can be set by commands.
Figure 18.3-10 shows an example of vertical display period control.
VSYNC input
(VSYNC pin)
Internal
VSYNC pulse
Vertical
display period
The start and end of a vertical display period can be specified as follows:
❍ Vertical display start timing
Display period control 1 (command 14-0): bits DYS10 to DYS0 = number of Hsync signals = 0 to
2047, set in units of 1 Hsync signals
❍ Vertical display end timing
Display period control 2 (command 14-1): bits DYE10 to DYE0 = number of Hsync signals = 0 to
2047, set in units of 1 Hsync signals
Figure 18.3-10 Vertical Display Period Control
Display signal
Display signal output enabled
output disabled
Display start timing
CHAPTER 18 OSDC
Display signal
output disabled
Display end timing
559
Advertisement
Table of Contents
