ST7781
17.7. Resizing Function
ST7781 supports resizing function (x1/2, x1/4), which is performed when writing image data to DRAM. The resizing
function is enabled by setting a window address area and the RSZ bit which represents the resizing factor (x1/2, x1/4) of
image. The resizing function allows the system to transfer the original-size image data into the DRAM with resized image
data.
Fig.17.8 Data Transfer in Resizing Mode
Fig.17.8.1 Resizing Example
Resized Image Resolution
Original Image Size (X × Y)
1/2 (RSZ=2’h1)
320 × 240
176 × 144
60 × 120
88 × 72
1/4 (RSZ=2’h3)
160 × 120
88 × 72
640 × 480
352 × 288
320 × 240
176 × 144
120 × 160
132 × 132
80× 60
44× 36
30 × 40
33 × 33
60× 80
66 × 66
Table 17.8.1: Resized Image Resolution
The RSZ bit sets the resizing factor of an image. When setting a window address area in the internal DRAM, the DRAM
window address area must fit the size of resized image. The following examples show the resizing setting.
Ver. 1.7
86
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