RM0090 Rev 18 503/1749
RM0090 LCD-TFT controller (LTDC)
514
16.7.15 LTDC Layerx Window Horizontal Position Configuration Register
(LTDC_LxWHPCR) (where x=1..2)
This register defines the Horizontal Position (first and last pixel) of the layer 1 or 2 window.
The first visible pixel of a line is the programmed value of AHBP[10:0] bits + 1 in the
LTDC_BPCR register.
The last visible pixel of a line is the programmed value of AAW[10:0] bits in the
LTDC_AWCR register.
Address offset: 0x88 + 0x80 x (Layerx -1), Layerx = 1 or 2
Reset value: 0x0000 0000
Example:
The LTDC_BPCR register is configured to 0x000E0005(AHBP[11:0] is 0xE) and the
LTDC_AWCR register is configured to 0x028E01E5(AAW[11:0] is 0x28E). To configure the
horizontal position of a window size of 630x460, with horizontal start offset of 5 pixels in the
Active data area.
1. Layer window first pixel: WHSTPOS[11:0] should be programmed to 0x14 (0xE+1+0x5)
2. Layer window last pixel: WHSPPOS[11:0] should be programmed to 0x28A
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
WHSPPOS[11:0]
rw rw rw rw rw rw rw rw rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
WHSTPOS[11:0]
rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:28 Reserved, must be kept at reset value
Bits 27:16 WHSPPOS[11:0]: Window Horizontal Stop Position
These bits configure the last visible pixel of a line of the layer window.
The following condition must be respected:
WHSPPOS[11:0] ≥ AHBP[10:0] bits + 1 (programmed in LTDC_BPCR register)
Bits 15:12 Reserved, must be kept at reset value
Bits 11:0 WHSTPOS[11:0]: Window Horizontal Start Position
These bits configure the first visible pixel of a line of the layer window.
The following condition must be respected:
WHSTPOS[11:0] must be ≤ AAW[10:0] bits (programmed in the LTDC_AWCR
register).
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