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Integrated Functions (Continued)

4.4.3.1 Monochrome Patterns

Setting the pattern mode to 01b (GX_BASE+8200h[9:8] =

01b) in the GP_RASTER_MODE register selects the

monochrome patterns (see bit details on page 132). Those

pixels corresponding to a clear bit (0) in the pattern are ren-

dered using the color specified in the GP_PAT_COLOR_0

(GX_BASE+8110h) register, and those pixels correspond-

ing to a set bit (1) in the pattern are rendered using the

color

specified

the

GP_PAT_COLOR_1

(GX_BASE+8112h).

If the pattern transparency bit is set high in the

GP_RASTER_MODE register, those pixels corresponding

to a clear bit in the pattern data are not drawn.

Monochrome patterns use registers GP_PAT_DATA_0

(GX_BASE+ Memory Offset 8120h) and GP_PAT_DATA_1

(GX_BASE+ Memory Offset 8124h) for the pattern data.

Bits [7:0] of GP_PAT_DATA_0 correspond to the first row of

the pattern, and bit 7 corresponds to the leftmost pixel on

the screen. How the pattern and the registers fully relate is

illustrated in Figure 4-12.

Figure 4-12. Example of Monochrome Patterns

4.4.3.2

Dither Patterns

Setting the pattern mode to 10b (GX_BASE+8200h[9:8] =

10b) in the GP_RASTER_MODE register selects the dither

patterns. Two bits of pattern data are used for each pixel,

allowing color expansion to four colors. The colors are

specified

the

GP_PAT_COLOR_0

through

GP_PAT_COLOR_3 registers (Table 4-24 on page 130).

Dither patterns use all 128 bits of pattern data. Bits [15:0]

of GP_PAT_DATA_0 correspond to the first row of the pat-

tern (the lower byte contains the least significant bit of each

pixel’s pattern color and the upper byte contains the most

significant bit of each pixel’spattern color). Thisisillus-

trated in Figure 4-13.

Figure 4-13. Example of Dither Patterns

GP_PAT_DATA_0 (GPD0) = 0x80412214

GP_PAT_DATA_1 (GPD1) = 0x08142241

GPD0[7:0]

GPD0[15:8]

GPD0[23:16]

GPD0[31:24]

GPD1[7:0]

GPD1[15:8]

GPD1[23:16]

GPD1[31:24]

00AA

4411

00AA

1155

00AA

4411

00AA

1155

GP_PAT_DATA_0 (GPD0) = 0x441100AA

GP_PAT_DATA_1 (GPD1) = 0x115500AA

GP_PAT_DATA_2 (GPD2) = 0x441100AA

GP_PAT_DATA_3 (GPD3) = 0x115500AA

GPD0[15:0]

GPD0[31:16]

GPD1[15:0]

GPD1[31:16]

GPD2[15:0]

GPD2[31:16]

GPD3[15:0]

GPD3[31:16]

01 00

01 00 01 00

01 00

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