CL-PS7500FE 查看數據表（PDF） - Cirrus Logic

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CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

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

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