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S1D13705 Hardware Functional Specification
X27A-A-001-10 Issue Date: 02/02/01
bit 2 reserved
reserved bits must be set to 0.
bits 1-0 SwivelView Mode Pixel Clock Select Bits [1:0]
These two bits select the Pixel Clock (PCLK) sou rc e in SwivelView Mode - these bits
have no effect in Landscape Mode. The following table shows the selection of PCLK and
MCLK in SwivelView Mode - see Section 12, “SwivelView™” on page 77 for details.
bits 7-0 Line Byte Count Bits [7:0]
This register is the byte count from the beginning of one line to the beginning of the next
consecutive line (commonly called “stride” by progr ammers). Thi s re gister may be used to
create a virtual image in SwivelView mode.
When this register = 00 the “stride” = 256 bytes. This value is used for 240x320 8 bpp
default SwivelView mode
When the Line Byte Count Register = n, where 1 n FFh, the “stride” = n bytes.
REG[1Eh] and REG[1Fh]
REG[1Eh] and REG[1Fh] are reserved for factory S1D13705 testing and should not be
written. Any value written to these registers may result in damage to the S1D13705 and/or
any panel connected to the S1D13705.
Table 8-8: Selection of PCLK and MCLK in SwivelView Mode
SwivelView
Mode Enable
(REG[1Bh] bit 7)
SwivelView
Mode Select
(REG[1Bh] bit 6)
Pixel Clock (PCLK) Select
(REG[1Bh] bits [1:0] PCLK = MCLK =
Bit 1 Bit 0
0 X X X CLK See Reg[02h] bit 5
1000CLKCLK
1001CLK/2CLK/2
1010CLK/4CLK/4
1011CLK/8CLK/8
1100CLK/2CLK
1101CLK/2CLK
1110CLK/4CLK/2
1111CLK/8CLK/4
Where CLK is CLKI (REG[02h] bit 4 = 0) or CLKI/2 (REG[02h] bit 4 = 1)
REG[1Ch] Line Byte Count Register for SwivelView Mode
Address = 1FFFCh Read/Write
Line Byte
Count bit 7 Line Byte
Count bit 6 Line Byte
Count bit 5 Line Byte
Count bit 4 Line Byte
Count bit 3 Line Byte
Count bit 2 Line Byte
Count bit 1Line Byte
Count bit 0