S1D13700F01 Epson Electronics America, Inc., S1D13700F01 Datasheet - Page 80

• Manufacturer Part Number: S1D13700F01
• Description: Embedded Memory Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 80
12.2.2 Display Address Scanning
S1D13700F01
X42A-A-002-04
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 S1D13700F01 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 4.05
C/R
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
SAD + C/R
SAD + AP
Issue Date: 2005/12/13
+ C/R