5.2.7.50 Overlay 1 Configuration Register 9

This register can only be written if O1WPCFGE is cleared in the LCDC Write Protection Mode Register.

Name:	LCDC_OVR1CFG9
Offset:	0x000001A0
Reset:	0x00000000
Property:	Read/Write


Bit	31	30	29	28	27	26	25	24
	A1[7:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	A0[7:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	DFACTA[1:0]		DFACTC[2:0]			SFACTA[1:0]		SFACTC[2]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	SFACTC[1:0]				DSTKEY	CRKEY	REP	DMA
Access	R/W	R/W			R/W	R/W	R/W	R/W
Reset	0	0			0	0	0	0

Bits 31:24 – A1[7:0] Alpha 1 Value

Operand used in the Alpha blending process depending on factor value.

Bits 23:16 – A0[7:0] Alpha 0 Value

Operand used in the Alpha blending process depending on factor value.

Bits 15:14 – DFACTA[1:0] Destination Factor for the Blending Equation of the Alpha Component

Value	Name	Description
0	ZERO	Sets the factor to 0.0.
1	ONE	Sets the factor to 1.0.
2	M_A0_MUL_AS	Computes A0 multiplied by source alpha, then sets the factor to one minus the result.
3	A1	Sets the factor to A1/255.

Bits 13:11 – DFACTC[2:0] Destination Factor for the Blending Equation of the Color Component

Value	Name	Description
0	ZERO	Sets the factor to 0.0.
1	ONE	Sets the factor to 1.0.
2	A0	Sets the factor to A0/255.
3	A1	Sets the factor to A1/255.
4	A0_MULT_AD	Sets the factor to A0 multiplied by Destination Alpha.
5	M_A0_MULT_AD	Sets the factor to A0 multiplied by Destination Alpha, then sets the factor to one minus the result.
6	M_A0_MUL_AS	Computes A0 multiplied by source alpha0, then sets the factor to one minus the result.
7	M_A0	Computes one minus A0, then sets the factor to one minus the result.

Bits 10:9 – SFACTA[1:0] Source Factor for the Blending Equation of the Alpha Component

Value	Name	Description
0	ZERO	Sets the factor to 0.0.
1	ONE	Sets the factor to 1.0.
2	A0	Sets the factor to A0/255.
3	A1	Sets the factor to A1/255.

Bits 8:6 – SFACTC[2:0] Source Factor for the Blending Equation of the Color Component

Value	Name	Description
0	ONE	Sets the factor to 1.0.
1	ZERO	Sets the factor to 0.0.
2	A0	Sets the factor to A0/255.
3	A0_MULT_AD	Sets the factor to A0 multiplied by Destination Alpha.
4	A0_MUL_AS	Sets the factor to A0 multiplied by Source Alpha.
5	M_A0_MUL_AD	Computes A0 multiplied by Destination Alpha, then sets the factor to minus the result .

Bit 3 – DSTKEY Destination Color Keying

Value	Description
0	When CRKEY is enabled, color key is applied on OVR1 pixels, before the blending operation.
1	When CRKEY is enabled, color key is applied on OVR1 pixels, after the blending operation.

Bit 2 – CRKEY Chroma Keying Enable

Bit 1 – REP Replication Logic

The alpha component is also affected by the replication logic.

In all ARGB formats with one transparency bit, the REP configuration affects the A field interpretation when A=1. If REP=0, then A=1 is interpreted as Alpha = 0x80 (half transparent). If REP=1, then A=1 is interpreted as Alpha = 0xFF (full opaque).

Value	Description
0	When the selected pixel depth is less than 24 bpp, the pixel is shifted and LSBs are set to 0.
1	When the selected pixel depth is less than 24 bpp, the pixel is shifted and the LSB replicates the MSB.

Bit 0 – DMA DMA Enable

Value	Description
0	The pixel for the current layer is retrieved from the default color register.
1	The pixel stream is retrieved from the memory.