参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 14/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - ON SCREEN DISPLAY CONTROLLER (OSD)
OSD CONTROLLER (Cont’d)
7.4.7.7 Extended parallel mode
In extended parallel mode, each character code (1
byte) is followed by a palette attribute (1 byte) and
a shape attribute (1 byte). Refer to Figure 52.
Let’s assume that the start address of the current
row buffer is 2p (even address).
The character codes are stored in the OSDRAM at
the address 2p+3+3z, the palette attributes are
stored at the address 2p+4+3z, and the shape at-
tributes are stored at the address 2p+5+3z, where
z range value is 1 to RCN (RCN is the row charac-
ter count defined in Section 7.4.7.2).
The character code structure, using the shape at-
tribute, allows you to point to any of the font ROM
characters.
The shape attribute definition depends on the font
matrix used for the row (it depends on the FM bit,
see Section 7.4.7.3).
CHARACTER CODE IN EXTENDED PARALLEL
MODE
Address in segment 22h: 2p+3+3z. See Figure 52.
Bits 7:0 = CHC[7:0]
Character Code in extended
parallel mode
The CHC[7:0] bits are used, combined with 3 or 1
bits of the shape attribute (for a 9x13 or 18x26 ma-
trix), to point to any of the characters stored in the
font ROM (refer to the shape attribute description
for more details).
PALETTE ATTRIBUTE
Address in segment 22h: 2p+4+3z. See Figure 52.
Refer to Section 7.4.7.6 for the bit description.
70
CHC7
CHC6
CHC5
CHC4
CHC3
CHC2
CHC1 CHC0
70
FP3
FP2
FP1
FP0
BP3
BP2
BP1
BP0
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