1325
6437E–ATARM–23-Apr-13
SAM9M11
49.5.3
Interrupt Sources
The LCD Controller interrupt line is connected to one of the internal sources of the Advanced
Interrupt Controller. Using the LCD Controller interrupt requires prior programming of the AIC.
49.6
Functional Description
and the LCD controller core (LCDC core). The DMA controller reads the display data from an
external memory through a AHB master interface. The LCD controller core formats the display
data. The LCD controller core continuously pumps the pixel data into the LCD module via the
LCD data bus (LCDD[23:0]); this bus is timed by the LCDDOTCK, LCDDEN, LCDHSYNC, and
LCDVSYNC signals.
49.6.1
DMA Controller
49.6.1.1
Configuration Block
The configuration block is a set of programmable registers that are used to configure the DMA
controller operation. These registers are written via the AHB slave interface. Only word access is
allowed.
49.6.1.2
AHB Interface
This block generates the AHB transactions. It generates undefined-length incrementing bursts
as well as 4-, 8- or 16-beat incrementing bursts. The size of the transfer can be configured in the
BRSTLN field of the DMAFRMCFG register. For details on this register, see
“DMA Frame Con-49.6.1.3
Channel-U
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:
where:
X_size = ((LINESIZE+1)*Bpp+PIXELOFF)/32
Y_size = (LINEVAL+1)
Table 49-3.
Peripheral IDs
Instance
ID
LCDC
23
Frame_size
X_size*Y_size
32
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