Table 8-1: Maximum Value Of Line Byte Count Register - 8-Bit Display Memory Interface; Table 8-2: Maximum Value Of Line Byte Count Register - 16-Bit Display Memory Interface - Epson SED1352 Technical Manual

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AUX[02h] Line Byte Count Register (LSB)
I/O address = 0010b, Read/Write.
Line Byte Line Byte
Count Bit 7 Count Bit 6
bits 7-0 Line Byte Count Bits [7:0]
These are the 8 LSB of the 9 bit Total Display Line Count and represent the number of scan lines -1, to
a maximum value of 3FFh or 1024 scan lines. Line Byte Count Bit 8 is located in register AUX[05h] and
is ignored in the 16-bit memory interface. To calculate the Line Byte Count use the following formula:
Example:
To calculate the Line Byte Count for 640 horizontal pixels with 16 gray shades (4 bits-per-pixel) and 16-bit
memory interface:
The following two tables summarize the maximum value of the Line Byte Count Register for different dis-
play modes and display memory interface.

Table 8-1: Maximum Value of Line Byte Count Register - 8-Bit Display Memory Interface

16-level gray shades

Table 8-2: Maximum Value of Line Byte Count Register - 16-Bit Display Memory Interface

16-level gray shades
AUX[03h] Line Byte Count Power Save Register (MSB)
I/O address = 0011b, Read/Write
PS PS
Bit 1 Bit 0
bits 7-6 PS Bits [1:0]
Selects the Power Save Modes as shown in the following table. The PS bits [1:0] go low on RESET.
SED1352
X16-SP-001-16
Line Byte Line Byte
Count Bit 5 Count Bit 4
 BitsPerPixel
LineByteCount = ------------------------------------------------------------- -

MemoryInterfaceWidth
LineByteCount
Display Mode
4-level gray shades
Display Mode
4-level gray shades
LCD Signal LUT
State Bypass
Line Byte Line Byte
Count Bit 3 Count Bit 2
×
HorizontalResolution
4BitsPerPixel
×
= ------------------------------------ - 640 1 – =
16Bits
Maximum Value of
Line Byte Count Register
0FFh
1FFh
Maximum Value of
Line Byte Count Register
0FFh
0FFh
n/a n/a
Epson Research and Development
Vancouver Design Center
Line Byte Line Byte
Count Bit 1 Count Bit 0
 1
–

159
Corresponding Maximum
Number of Pixels in One
Display Line
256 x 4 = 1024
512 x 2 = 1024
Corresponding Maximum
Number of Pixels in One
Display Line
256 x 8 = 2048
256 x 4 = 1024
Line Byte
n/a
Count Bit 8
Hardware Functional Specification
Issue Date: 99/07/28