Z90251 Datasheet, PDF (39/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
31
Bit/
Field
Bit
Position R/W Value Description
V_BLANK Delay
Foreground Character for
Halftone Effect
Reserved
Mesh Window Row
7, 6, 5, 4 R/W
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
No Delay
Delay by 0.5 Dot-Clock Period
Delay by 1.0 Dot-Clock Period
Delay by 1.5 Dot-Clock Period
Delay by 2.0 Dot-Clock Period
Delay by 2.5 Dot-Clock Period
Delay by 3.0 Dot-Clock Period
Delay by 3.5 Dot-Clock Period
Delay by 4.0 Dot-Clock Period
Delay by 4.5 Dot-Clock Period
Delay by 5.0 Dot-Clock Period
Delay by 5.5 Dot-Clock Period
Delay by 6.0 Dot-Clock Period
Delay by 6.5 Dot-Clock Period
Delay by 7.0 Dot-Clock Period
Delay by 7.5 Dot-Clock Period
3
R/W 0 Not included
1 Included
2, 1
R/W
Must be 0
0
R/W 0 No mesh OSD for Next Row
1 Mesh OSD for Next Row
Bits 7, 6, 5, and 4, VBLANK Delay, set the amount of time that the VBLANK signal
is properly aligned with the OSD RGB output with delay from external circuitries.
Bit 3, Character Foreground for Halftone Effect, defines whether displaying a
foreground color for character display is included. If bit 3 is set to 0, halftone is
disabled for pixels with foreground color. If bit 3 is set to 1, halftone is active for
pixels with both foreground and background colors.
Bit 0, Mesh Window Row, sets the mesh effect to On or Off for the next row of the
OSD.
Table 16 Mesh Control Register 07h: Bank F (MC_Reg)
Bit
7
6
5
4
3
2
1
0
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
Reset
0
0
0
0
0
0
0
0
Note: R = Read W = Write X = Indeterminate
PS001301-0800