Specifications

Rev. 2.1 EPSON 6–13
S1D12400 Series
S1D12400
Series
6. FUNCTION DESCRIPTION
MPU Interfaces
In the S1D12400 series, an MPU type, interface bit length and interface method can be selected depending on pins IF, P/
S and C86.
Selection of MPU
In the S1D12400 series, when parallel input is selected (P/S = HIGH), pin C86 has an MPU selecting function.
When either HIGH or LOW is selected as the polarity of pin C86, the 80 series MPU or 68 series MPU can be selected
as shown in Table 1.
Selection of an interface bit length (8 bits, 4 bits) is performed by pin IF.
Table 1
Selection of interface type
In the S1D12400 series, it is possible to select an 8-bit or 4-bit parallel interface or a serial interface that permits a data
transfer through a serial input (SI). As the selecting method, set the polarity of pins of P/S and IF to HIGH or LOW.
Table 2
Interface with 4-bit MPU
When data is transferred by a 4-bit interface (IF = 0), 8-bit commands, data and addresses are divided into 2 parts for
transfer. A timing example of the 80 series MPU is shown below.
Note: For continuous writing, perform it after securing a time exceeding the system cycle time (t
cyc).
Serial interface (P/S = LOW)
The serial interface consists of an 8-bit shift register and a 3-bit counter, and becomes ready to accept an SI input or SCL
input in the chip selected state (CS = LOW).
Unless any chip is selected, the shift register and the counter are reset to the initial state. (Refresh state)
Data is input in the order of D7, D6, .... D0 from the serial data input pin (SI) at the rise of the serial clock (SCL). At the
rising edge of the 8th serial clock, the data is converted into parallel data.
Whether the serial data input (SI) is display data or a command is identified and judged by A0 input. When A0 = HIGH,
the data becomes display data. When A0 = LOW, the data becomes a command. The A0 input is read and identified at
the rise of the 8 × nth serial clock (SCL) after chip selection.
MPU type Pin C86 state Polarity of RES function input
MPU connection
A0 WR CS D0 to D7
68 series HIGH level
LOW level active
A0 E CS D0 to D7
80 series LOW level A0 WR CS D0 to D7
Interface Interface Selecting pin state Pin state
type bit length P/S IF CS A0 WR D7 D6 D5 D4 D3 D2 D1 D0
Parallel 8 bits HIGH HIGH CS A0 WR D7 D6 D5 D4 D3 D2 D1 D0
Parallel 4 bits HIGH LOW CS A0 WR D7 D6 D5 D4
OPEN or HIGH or LOW
Serial 1 bit LOW HIGH or LOW CS A0 HIGH or LOW SI SCL OPEN or HIGH or LOW
CS
WR
D7 to D4 Upper (D7 to D4) Lower (D3 to D0)