
Epson Research and Development
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Vancouver Design Center
Hardware Functional Specification
SED1352
Issue Date: 99/07/28
X16-SP-001-16
AUX[08h] bits 7-0 Screen 2 Display Start Address Bits [15:0]
AUX[09h] bits 7-0 These 16 bits determine the Screen 2 Display Start Address. In an 8-bit memory configuration these bits
set the 16-bit start address (i.e., byte access). In a 16-bit memory configuration these are the 16 most sig-
nificant bits of a 17-bit start address (i.e., word access).
In a dual panel configuration, screen 2 refers to the lower half of the display. The Screen 2 Display Start
Address is the memory address corresponding to first displayed pixel in the first line of the lower half of
the display. If screen 2 is started right after screen 1, the Screen 2 Display Start Address is calculated with
the following formula.
In a single panel configuration, screen 2 refers to the second screen of the Split Screen Display Feature
where two different images (screen 1 and screen 2) can be displayed at the same time on one display. The
Screen 2 Display Start Address is the memory address corresponding to the first pixel of the second image
stored in display memory. To display screen 2 refer to AUX[0Ah] Screen 1 Display Line Count Register
(LSB) below.
AUX[08h] Screen 2 Display Start Address Register (LSB)
I/O address = 1000b, Read/Write.
Screen 2
Display
Start Addr
Bit 7
Screen 2
Display
Start Addr
Bit 6
Screen 2
Display
Start Addr
Bit 5
Screen 2
Display
Start Addr
Bit 4
Screen 2
Display
Start Addr
Bit 3
Screen 2
Display
Start Addr
Bit 2
Screen 2
Display
Start Addr
Bit 1
Screen 2
Display
Start Addr
Bit 0
AUX[09h] Screen 2 Display Start Address Register (MSB)
I/O address = 1001b, Read/Write.
Screen 2
Display
Start Addr
Bit 15
Screen 2
Display
Start Addr
Bit 14
Screen 2
Display
Start Addr
Bit 13
Screen 2
Display
Start Addr
Bit 12
Screen 2
Display
Start Addr
Bit 11
Screen 2
Display
Start Addr
Bit 10
Screen 2
Display
Start Addr
Bit 9
Screen 2
Display
Start Addr
Bit 8
Screen2 DisplayStartAddress hex
(
)
Imag eH orizon ta lResolution
(
)
Imag eVerticalResolution
(
)
BytesPerPixel
(
)
×
×
2
Memo ryInterfa ceW idth
8
----------------------------------------------------------------
×
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Screen 1Displa yS ta rtAd dress
+
=