Epson S1D13708 Manuel D’Utilisation

Page 16

Vancouver Design Center

S1D13708

Connecting to a Micro-Controller via the Indirect Interface

X39A-G-020-01

Issue Date: 01/12/12

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.