Nuvoton NUC970 series, Technical Reference Manual, Page: 1131 / 1251

NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 1131 - Revision V1.30
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CRTC Internal Vertical Retrace Timing Register (CRTC_VR)
The vertical retrace timing can be controlled by properly setting the values of starting (VRS) and
ending (VRE) registers included in this register. The values are programmed in numbers of scan-
line.
Register Offset R/W Description Reset Value
CRTC_VR 0x20 R/W CRTC Internal Vertical Retrace Timing Register 0x0000_0000
31 30 29 28 27 26 25 24
Reserved VRE[10:8]
23 22 21 20 19 18 17 16
VRE[7:0]
15 14 13 12 11 10 9 8
Reserved VRS[10:8]
7 6 5 4 3 2 1 0
VRS[7:0]
Bits Description
[31:27] Reserved Reserved.
[26:16] VRE
CRTC Vertical Internal Retrace End Low
An 11-bit value is programmed in number of scan line, at which the internal vertical
retrace becomes inactive.
[15:11] Reserved Reserved.
[10:0] VRS
CRTC Vertical Internal Retrace Start Timing
An 11-bit value is programmed in number of scan line, at which the internal vertical
retrace becomes active.