sed1355 ETC-unknow, sed1355 Datasheet - Page 182

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 26
5.2.1 Registers
SED1355
X23A-G-003-05
REG[10h] Screen 1 Display Start Address 0
REG[11h] Screen 1 Display Start Address 1
REG[12h] Screen 1 Display Start Address 2
REG[18h] Pixel Panning Register
Start Addr
Start Addr
Pixel Pan
Screen 2
Bit 15
Bit 7
Bit 3
n/a
Start Addr
Start Addr
Pixel Pan
Screen 2
Bit 14
Bit 6
Bit 2
n/a
These three registers form the address of the word in the display buffer where screen 1 will start
displaying from. Changing these registers by one will cause a change of 0 to 16 pixels depending on
the current color depth. Refer to the following table to see the minimum number of pixels affected
by a change of one to these registers.
The pixel panning register offers finer control over pixel pans than is available with the Start Address
Registers. Using this register it is possible to pan the displayed image one pixel at a time. Depending
on the current color depth certain bits of the pixel pan register are not used. The following table
shows this.
Color Depth (bpp)
Start Addr
Start Addr
Table 5-1: Number of Pixels Panned Using Start Address
Pixel Pan
15
16
Screen 2
1
2
4
8
Bit 13
Bit 5
Bit 1
n/a
Figure 5-3: Screen 1 Start Address Registers
Color Depth (bpp)
Figure 5-4: Pixel Panning Register
Table 5-2: Active Pixel Pan Bits
15/16
Start Addr
Start Addr
Pixels per Word
Pixel Pan
Screen 2
1
2
4
8
Bit 12
Bit 4
Bit 0
n/a
16
8
4
2
1
1
Start Addr
Start Addr
Start Addr
Pixel Pan
Screen 1
Pixel Pan bits used
Bit 11
Bit 19
Bit 3
Bit 3
bits [3:0]
bits [2:0]
bits [1:0]
Number of Pixels Panned
bit 0
---
Start Addr
Start Addr
Start Addr
Pixel Pan
Screen 1
Bit 10
Bit 18
Bit 2
Bit 2
16
8
4
2
1
1
Epson Research and Development
Start Addr
Start Addr
Start Addr
Pixel Pan
Screen 1
Programming Notes and Examples
Bit 17
Bit 1
Bit 9
Bit 1
Vancouver Design Center
Issue Date: 99/04/27
Start Addr
Start Addr
Start Addr
Pixel Pan
Screen 1
Bit 16
Bit 0
Bit 8
Bit 0