CL-PS7500FE Datasheet, PDF (148/251 Pages) Cirrus Logic – System-on-a Chip for Internet Appliance

CL-PS7500FE
System-on-a-Chip for Internet Appliance
16.13 Horizontal Cursor Start Register (HCSR): Address 0x86
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1000 0110
XXXXXXXXXXXXX
HCSR value
This register defines the time, in pixels, from the start of the HSYNC pulse to the start of the cursor display.
This is a 14-bit register where all bits can be programmed. If N pixels are required in this time, then pro-
gram the value (N − 17) into the HCSR. The cursor can thus be programmed to start on any pixel. In HiRes
mode, the cursor can still only be programmed to start on a normal pixel boundary. However, because the
resolution of the cursor can be defined to a µ-pixel, by using different cursor images it is possible to posi-
tion the cursor to any µ-pixel.
NOTE: Only the cursor start position needs to be defined, as the cursor is automatically disabled after 32 pixels in
normal mode or 16 pixels in HiRes mode. If a smaller cursor is required, program the remaining bits in the
cursor pattern to logical color ‘00’ (transparent).
16.14 Horizontal Interlace Register (HIR): Address 0x87
Address 87H is reserved. Do not program this register.
16.15 Horizontal Test Registers: Addresses 0x88 and 0x8H
These two registers are provided for test purposes only. Neither of these registers are intended for use
during normal operation.
16.16 Vertical Cycle Register (VCR): Address 0x90
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 01 0 0 00
X X X X X X X X X X X XX
VCR value
This 13-bit register defines the period, in units of a raster, of the ver tical scan (that is,
display time + FLYBACK time). If N rasters are required in a complete frame, then value (N − 2) should be
programmed into the VCR. If an interlaced display is selected, (N − 3) ÷ 2 must be programmed into the
VCR (N must be odd.) Here N is still the number of rasters in a complete frame, not a field.
June 1997
ADVANCE DATA BOOK v2.0
THE VIDEO SOUND AND PROGRAMMER’S MODEL
147