Filter
Top Products
LCD CONTROLLER S3C2410A
15-32
FRAME BUFFER START ADDRESS 1 REGISTER
Register Address R/W Description Reset Value
LCDSADDR1 0X4D000014 R/W STN/TFT: Frame buffer start address 1 register 0x00000000
LCDSADDR1 Bit Description Initial State
LCDBANK [29:21] These bits indicate A[30:22] of the bank location for the video buffer in
the system memory. LCDBANK value cannot be changed even when
moving the view port. LCD frame buffer should be within aligned 4MB
region, which ensures that LCDBANK value will not be changed when
moving the view port. So, care should be taken to use the malloc()
function.
0x00
LCDBASEU [20:0] For dual-scan LCD: These bits indicate A[21:1] of the start address of
the upper address counter, which is for the upper frame memory of
dual scan LCD or the frame memory of single scan LCD.
For single-scan LCD: These bits indicate A[21:1] of the start address
of the LCD frame buffer.
0x000000
FRAME Buffer Start Address 2 Register
Register Address R/W Description Reset Value
LCDSADDR2 0X4D000018 R/W STN/TFT: Frame buffer start address 2 register 0x00000000
LCDSADDR2 Bit Description Initial State
LCDBASEL [20:0] For dual-scan LCD: These bits indicate A[21:1] of the start address of
the lower address counter, which is used for the lower frame memory
of dual scan LCD.
For single scan LCD: These bits indicate A[21:1] of the end address
of the LCD frame buffer.
LCDBASEL = ((the fame end address) >>1) + 1
= LCDBASEU +
(PAGEWIDTH+OFFSIZE)x(LINEVAL+1)
0x0000
NOTE: Users can change the LCDBASEU and LCDBASEL values for scrolling while the LCD controller is turned on.
But, users must not change the value of the LCDBASEU and LCDBASEL registers at the end of FRAME by referring
to the LINECNT field in LCDCON1 register, for the LCD FIFO fetches the next frame data prior to the change in the
frame.
So, if you change the frame, the pre-fetched FIFO data will be obsolete and LCD controller will display an incorrect
screen. To check the LINECNT, interrupts should be masked. If any interrupt is executed just after reading
LINECNT,
the read LINECNT value may be obsolete because of the execution time of Interrupt Service Routine (ISR).