sed1355 ETC-unknow, sed1355 Datasheet - Page 125
sed1355
Manufacturer Part Number
sed1355
Description
Sed1355 Embedded Ramdac Lcd/crt Controller
Manufacturer
ETC-unknow
Datasheet
1.SED1355.pdf
(509 pages)
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bits 7-0
bits 7-4
Hardware Functional Specification
Issue Date: 99/05/18
Look-Up Table Data Register
REG[26h]
LUT Data
Bit 3
LUT Data
Bit 2
For example, writing a value 03h into the LUT Address Register sets the pointer to R[3]. A subse-
quent access to the LUT Data Register accesses R[3] and moves the pointer onto G[3]. Subsequent
accesses to the LUT Data Register move the pointer onto B[3], R[4], G[4], B[4], R[5], etc. Note that
the RGB data is inserted into the LUT after the Blue data is written, i.e. all three colors must be
written before the LUT is updated.
LUT Address Bits [7:0]
These 8 bits control a pointer into the Look-Up Tables (LUT). The SED1355 has three 256-posi-
tion, 4-bit wide LUTs, one for each of red, green, and blue – refer to “Look-Up Table Architecture”
for details.
This register selects which LUT entry is read/write accessible through the LUT Data Register
(REG[26h]). Writing the LUT Address Register automatically sets the pointer to the Red LUT.
Accesses to the LUT Data Register automatically increment the pointer.
LUT Data
This register is used to read/write the RGB Look-Up Tables. This register accesses the entry at the
pointer controlled by the Look-Up Table Address Register (REG[24h]) – see above.
Accesses to the Look-Up Table Data Register automatically increment the pointer.Note that the
RGB data is inserted into the LUT after the Blue data is written, i.e. all three colors must be written
before the LUT is updated.
LUT Data
Bit 1
LUT Data
Bit 0
n/a
n/a
n/a
n/a
X23A-A-001-11
SED1355
Page 119
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