at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 866

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

43.5.1.3
43.5.1.4
43.5.1.5
866
AT91SAM9263 Preliminary
Channel-U
Channel-L
Control
BRSTLN field of the DMAFRMCFG register. For details on this register, see
figuration Register” on page
This block stores the base address and the number of words transferred for this channel (frame
in single scan mode and Upper Panel in dual scan mode) since the beginning of the frame. It
also generates the end of frame signal.
It has two pointers, the base address and the number of words to transfer. When the module
receives a new_frame signal, it reloads the number of words to transfer pointer with the size of
the frame/panel. When the module receives the new_frame signal, it also reloads the base
address with the base address programmed by the host.
The size of the frame/panel can be programmed in the FRMSIZE field of the DMAFRMCFG
Register. This size is calculated as follows:
X_size = ((LINESIZE+1)*Bpp+PIXELOFF)/32
Y_size = (LINEVAL+1)
Note:
This block has the same functionality as Channel-U, but for the Lower Panel in dual scan mode
only.
This block receives the request signals from the LCDC core and generates the requests for the
channels.
• LINESIZE is the horizontal size of the display in pixels, minus 1, as programmed in the
• Bpp is the number of bits per pixel configured.
• PIXELOFF is the pixel offset for 2D addressing, as programmed in the DMA2DCFG register.
• LINEVAL is the vertical size of the display in pixels, minus 1, as programmed in the LINEVAL
LINESIZE field of the LCDFRMCFG register of the LCD Controller.
Applicable only if 2D addressing is being used.
field of the LCDFRMCFG register of the LCD Controller.
X_size is calculated as an up-rounding of a division by 32. (This can also be done adding 31 to the
dividend before using an integer division by 32). When using the 2D-addressing mode (see
Memory Addressing” on page
cuted and the FRMSIZE field programmed with every movement of the displaying window, since a
change in the PIXELOFF field can change the resulting FRMSIZE value.
Frame_size
896.
=
X_size*Y_size
------------------------------------- -
888), it is important to note that the above calculation must be exe-
32
6249D–ATARM–20-Dec-07
“DMA Frame Con-
“2D