
15 LCD CONTROLLER
134
EPSON
S1C38000 TECHNICAL MANUAL
Figure 15-3 Display Data Byte/Word Swap
Note: For further information on byte swapping for Big Endian mode, see Section 15.12, “Big-
Endian Bus Interface” on page 153.
bit 2
Latch Byte Select
This bit selects the byte which, when written, latches the data in LCD[58h] and
LCD[5Ch] into the LCD Controller.
When this bit is set to 0 the following is in effect:
In Little Endian mode the effect of LCD[58h] and LCD[5Ch] takes place only after
LCD[5Ch] bits [7:0] are written and at the next vertical non-display period.
In Big Endian mode the effect of LCD[58h] and LCD[5Ch] takes place only after
LCD[5Ch] bits [31:24] are written and at the next vertical non-display period.
When this bit is set to 1 the following is in effect:
In Little Endian mode the effect of LCD[58h] and LCD[5Ch] takes place only after
LCD[5Ch] bits [31:24] are written and at the next vertical non-display period.
In Big Endian mode the effect of LCD[58h] and LCD[5Ch] takes place only after
LCD[5Ch] bits [7:0] are written and at the next vertical non-display period.
bits 6–4
reserved
bit 3
LGPO3 Pin Output Status
When a HR-TFT panel is not selected (LCD[0Ch] bits [1:0]
≠ 10b) and a 1 is written to
this bit, the LGPO3 pin is driven high.
When a HR-TFT panel is not selected (LCD[0Ch] bits [1:0]
≠ 10b) and a 0 is written to
this bit, the LGPO3 pin is driven low.
When a HR-TFT panel is selected (LCD[0Ch] bits [1:0] = 10b) this bit has no effect.
bit 2
LGPO2 Pin Output Status
When a HR-TFT panel is not selected (LCD[0Ch] bits [1:0]
≠ 10b) and a 1 is written to
this bit, the LGPO2 pin is driven high.
When a HR-TFT panel is not selected (LCD[0Ch] bits [1:0]
≠ 10b) and a 0 is written to
this bit, the LGPO2 pin is driven low.
When a HR-TFT panel is selected (LCD[0Ch] bits [1:0] = 10b) this bit has no effect.
LGPO Status and Control Register
LCD[64h]
Default = 0000 0000h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
reserved reserved reserved
LGPO3
Status
LGPO2
Status
LGPO1
Status
LGPO0
Status
15
14
13
12
11
10
9876543210
byte 0
byte 1
byte 2
byte 3
32-bit display data
from display buffer
Byte Swap
Word Swap
Data
Serialization
To LUT