S1D13700F02 Epson Electronics America, Inc., S1D13700F02 Datasheet - Page 79

• Manufacturer Part Number: S1D13700F02
• Description: Embedded Memory Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
12.2.2 Display Address Scanning
Hardware Functional Specification
Issue Date: 2005/11/29
1
•
•
•
8
9
•
•
•
16
17
•
•
•
24
•
•
•
•
Note
Where:
SAD
SAD + AP
SAD + 2AP
Assumes REG[00h] bit 3 = 0, REG[01h] bits 3-0 = 8, REG[02h] bits 3-0 = 8
SAD = start address of the screen block
AP = horizontal address range (REG[06h], REG[07h])
C/R = number of character bytes per row (REG[03h])
Note
The S1D13700F02 scans the display memory in the same way as a raster scan CRT screen.
Each row is scanned from left to right until the address range equals C/R, REG[03h] bits 7-
0. Rows are scanned from top to bottom. When in graphics mode, at the start of each line
the address counter is set to the address at the start of the previous line plus the horizontal
address range (or address pitch), REG[06h] - REG[07h].
In text mode, the address counter is set to the same start address, and the same character
data is read, for each row in the character bitmap. However, a new row of the character
generator output is used each time. Once all the rows in the character bitmap have been
displayed, the address counter is set to the start address plus the horizontal address range
(or address pitch) and the next line of text is displayed.
SAD + 1
SAD + AP
One byte of display memory corresponds to one character.
Figure 12-4 Display Addressing in Text Mode Example
+ 1
SAD + 2
SAD + AP
+ 2
Revision 1.01
C/R
SAD + C/R
SAD + AP
+ C/R
X42D-A-001-01
S1D13700F02
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