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[2] For overlaying two graphic screens
1. Conditions
(1) 320 x 240 dots: Single-screen drive method (1/240 duty cycle)
(2) First layer: Graphic display
(3) Second layer: Graphic display
2. Display memory allocation
(1) First layer (graphic display)
Number of characters in horizontal direction = 320 / 8 = 40
Number of characters in vertical direction = 240 / 1 = 240
Therefore, the required size of memory is 40 x 240 = 9,600 bytes.
(2) Second layer (graphic display)
For the first layer, the required size of memory is 40 x 240 = 9,600 bytes.
S1D13700 Technical Manual
Example of display mode settings [2]
[Relationship between display and memory]
2580h
Second layer (graphics)
(9,600 bytes)
0000h
First layer (graphics)
(9,600 bytes)
EPSON
4AFFh
257Fh
4: FUNCTION DESCRIPTION
77
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