HD66781 Datasheet, PDF (42/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Resizing Control 1/2 (R004/R005h)
Preliminary
R/W RS
W1
W1
IB15 IB14 IB13 IB12 IB11 IB10 IB9 IB8 IB7 IB6 IB5 IB4 IB3 IB2 IB1 IB0
0000
0 0 ^{RCV RCV} 0 0 RCH1 RCH0 0
1
0
0 RSR1 RSR0
RSE RSE RSE RSE RSE RSE RSE RSE _{0 0}
V7 V6 V5 V4 V3 V2 V1 V0
0 0 0 0 0 RSEH
RSR[1:0]: Set the contraction scale which is applied during RAM write. When the resizing scale is set,
data are written to RAM according to this bit scale in horizontal and vertical directions. See the “Resizing
Function” (p.105) section for details.
RCH[1:0]: RCH specifies the number of surplus pixels in the horizontal direction, which are made after
resizing a picture. By specifying the number of surplus pixels, it is possible to disregard the surplus pixels
when data are transferred. This instruction is only available with resizing function. Set RCH = 2’h0 when
resizing function is not used (RSR = 2’h0).
RCV[1:0]: RCV specifies the number of surplus pixels in the vertical direction, which are made after
resizing a picture. By specifying the number of surplus pixels, it is possible to disregard the surplus pixels
when data are transferred. This instruction is only available with resizing function. Set RCV = 2’h0 when
resizing function is not used (RSR = 2’h0).
RSEH: Set the magnifying scale in the horizontal direction of a picture. When the magnifying scale is set,
data are written to RAM according to the bit scale in horizontal direction. See “Resizing Function” for
details.
RSEV[7:0]: Set magnifying scale in the vertical direction of a picture. When the magnifying scale is set,
the data in the internal RAM are magnified when displayed.
Note 1) When using picture magnification function, the picture resizing scale register (contraction) must be RSR1-0 = 2’h0.
Note 2) When using picture contraction function, the picture resizing scale (magnification) must be set RSEV7-0 = 8’h00,
RSEH = 0.
Note 3) Base picture scrolling function and vertical-direction display magnification function cannot be used simultaneously.
Settings for resizing scales
Table 10 Resizing scale ratio setting (RSR)
RSR[1:0]
2’h0
2’h1
2’h2
2’h3
Resizing scale
No resizing (x 1)
x 1/2
Setting disabled
x 1/4
Rev.0.5, July.31.2003, page 42 of 196