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Page 16 Epson Research and Development
Vancouver Design Center
S1D13708 Connecting to a Micro-Controller via the Indirect Interface
X39A-G-020-01 Issue Date: 01/12/12
5 Software
To implement the bus cycles in software, refer to the S1D13708 Hardware Functional
Specification, document number X39A-A-001-xx, for the bus timings. A minimum of three
steps must be implemented in software to use the Indirect Interface. The steps for an 8-bit
data transfer are:
• void command_write (char command_value)
• void data_write (char data_value)
• char data_read (void)
Example 1: The sequence for writing the S1D13708 register REG[7Ch] PIP+ Display Start
with a value of 28h is:
• command_write(0x7C);
• data_write(0x28);
Example 2: The sequence for reading the S1D13708 register REG[26h] FPFRAME Pulse
Start Register 0 is:
• command_write(0x26);
• value_returned= data_read();
Example 3: The sequence for writing to S1D13708 memory location 200h with two bytes
of data is:
• command_write(0xC0);
• data_write(0x00);
• command_write(0xC1);
• data_write(0x02);
• command_write(0xC2);
• data_write(0x00);
• command_write(0xC3); // note that no ‘data’ value is needed for the ‘start’ register
• data_write(0xAA); // 1st byte of data written to 0x200
• data_write(0x55); // 2nd byte of data written 20 0x201
To read memory, the same sequence as above is used except a ‘data_read()’ is called. Note
that the memory address is auto-incremented after a memory data access and the ‘start’
register REG[C3h] does not require a data value.