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Epson Research and Development
Vancouver Design Center
S1D13704
Interfacing to an 8-bit Processor
X26A-G-013-02
Issue Date: 01/02/12
4.2 S1D13704 Hardware Configuration
The S1D13704 uses CNF4 through CNF0 and BS# to allow selection of the bus mode and
other configuration data on the rising edge of RESET#. Refer to the S1D13704 Hardware
Functional Specification, document number X26A-A-001-xx for details.
The tables below show only those configuration settings important to the 8-bit processor
interface. The endian must be selected based on the 8-bit processor used.
4.3 Register/Memory Mapping
The S1D13704 needs a 64K byte block of memory to accommodate its 40K byte display
buffer and its 32 byte register set. The starting memory address is located at 0000h of the
64K byte memory block while the internal registers are located in the upper 32 bytes of this
memory block. (i.e. REG[0]= FFE0h).
An external decoder can be used to decode the address lines and generate a chip select for
the S1D13704 whenever the selected 64K byte memory block is accessed. If the processor
supports a general chip select module, its internal registers can be programmed to generate
a chip select for the S1D13704 whenever the S1D13704 memory block is accessed.
Table 4-1: Configuration Settings
Signal
Low
High
CNF0
See “Host Bus Selection” table below
See “Host Bus Selection” table below
CNF1
CNF2
CNF3
Little Endian
Big Endian
CNF4
Active low LCDPWR signal
Active high LCDPWR signal
= configuration for 8-bit processor host bus interface
Table 4-2: Host Bus Selection
CNF2
CNF1
CNF0
BS#
Host Bus Interface
1
1
1
1
Generic #2, 16-bit
= required configuration for this application.
*