S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 140

• Manufacturer Part Number: S1D13503
• Description: S1d13503 Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Page 44
5.3.2 Direct Mapping
S1D13503
X18A-G-002-06
Example 14: Write 12h to register 08h on the S5U13503B00C evaluation board; the base port address
1.
2.
This method of addressing requires 16 sequential I/O addresses starting from the base I/O address. The base I/O address is
determined by the power-on state of the SRAM data lines VD[7 through 12]. See “Summary of Configuration Options” in
the S1D13503 Hardware Functional Specification, Drawing Office No. X18A-A-001-xx.
To access the internal 16 registers of the S1D13503, simply perform I/O read/write functions to the absolute address as
defined in the previous paragraph.
There is no memory banking available in direct addressing mode.
Example 15: Write 12h to register 08h on the S5U13503B00C evaluation board; the base port address
1.
2.
Note
The S5U13503B00C is normally configured for indexed mapping, not direct mapping. Refer to the
S5U13503B00C Evaluation Board User’s Manual for more information configuring the
S5U13503B00C board for indexed or direct mapping.
Write 08h to the index register
The index register is at base port address + 0 = 310h.
MOV DX,310h
MOV AL,08h
OUT DX,AL
Write 12h to the data register
The data register is at base port address + 1 = 311h.
MOV DX,311h
MOV AL,12h
OUT DX,AL
Calculate the port address for register 08h.
Write the value 12h to port address 318h.
MOV DX,318h
MOV AL,12h
OUT DX,AL
is 310h, and indexed port mapping is used.
is 310h, and direct port mapping is used.
port address
=
310h
+
8h
=
318h
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/01/30