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Epson Research and Development

 

Vancouver Design Center

 

 

7.4 Registers

This section describes the registers used to set portrait mode operation.

REG[0Ch] Screen 1 Start Word Address LSB

bit 7

bit 6

bit 5

 

bit 4

bit 3

bit 2

bit 1

bit 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REG[0Dh] Screen 1 Start Word Address MSB

 

 

 

 

 

 

 

 

 

 

 

 

 

bit 15

bit 14

bit 13

 

bit 12

bit 11

bit 10

bit 9

bit 8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REG[0Eh] Screen 1 Start Word Address MSB

 

 

 

 

 

 

 

 

 

 

 

 

 

n/a

n/a

n/a

 

n/a

n/a

n/a

n/a

bit 16

 

 

 

 

 

 

 

 

 

The Screen 1 Start Address registers must be set correctly for portrait mode. In portrait mode the Start Address registers form a byte offset, as opposed to a word offset, into display memory.

The initial required offset is the portrait mode stride (in bytes) less one.

REG[1Ch] Line Byte Count Register

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

The line byte count register informs the S1D13705 of the stride, in bytes, between two consecutive lines of display in portrait mode. The Line Byte Count register only affects portrait mode operation and are ignored when the S1D13705 is in landscape display mode.

REG[1Bh] Portrait Mode Register

Portrait Mode

Portrait Mode

 

 

 

Portrait Mode

Portrait Mode

Portrait Mode

n/a

n/a

n/a

Memory

Pixel Clock

Pixel Clock

Enable

Select

 

 

 

Clock Select

Select Bit 1

Select Bit 0

 

 

 

 

 

 

 

 

 

 

 

 

 

The portrait mode register contains several items for portrait mode support.

The first is the Portrait Mode Enable bit. When this bit is “0” the S1D13705 is in landscape mode and the remainder of the settings in this register as well as the Line Byte Count in REG[1Ch] are ignored. Set this bit to “1” to enable portrait mode.

S1D13705

Programming Notes and Examples

X27A-G-002-03

Issue Date: 02/01/22

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Image 134
Epson S1D13705 technical manual REG0Ch Screen 1 Start Word Address LSB, REG0Dh Screen 1 Start Word Address MSB