ST7713 datasheet(29/159 Pages) SITRONIX

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ST7713

Ver 1.6

2008-05

9.3 6800-Series Parallel Interface (P68=’1’)

The MCU uses one of following interface: 11-lines with 8-data parallel interface, 12-lines with 9-data parallel interface,

19-lines with 16-data parallel interface, or 21-lines with 18-data parallel interface. The chip-select CSX(active low) enables

and disables the parallel interface. RESX (active low) is an external reset signal. The R/WX is the Read/Write flag and

D[17:0] is parallel data bus.

The LCD driver reads the data at the falling edge of E signal when R/WX= ‘1’ and Writes the data at the falling of the E

signal when R/WX=’0’. The D/CX is the data/command flag. When D/CX=’1’, D[17:0] bits are display RAM data or

command parameters. When D/C= ‘0’, D[17:0] bits are commands.

The 6800-series bi-directional interface can be used for communication between the micro controller and LCD driver. The

selection of this interface is done when P68 pin is high state (VDDI). Interface bus width can be selected with IM2, IM1 and

IM0.

The interface functions of 6800-series parallel interface are given in Table 9.3.1.

Table 9.3.1 The function of 6800-series parallel interface

P68 IM2 IM1 IM0

Interface

D/CX R/WX

Function

↓

Write 8-bit command (D7 to D0)

↓

Write 8-bit display data or 8-bit parameter (D7 to D0)

↓

Read 8-bit Display data (D7 to D0)

8-bit Parallel

↓

Read 8-bit parameter or status (D7 to D0)

↓

Write 8-bit command (D7 to D0)

↓

Write 16-bit display data or 8-bit parameter (D15 to D0)

↓

Read 16-bit Display data (D15 to D0)

16-bit Parallel

↓

Read 8-bit parameter or status (D7 to D0)

↓

Write 8-bit command (D7 to D0)

↓

Write 9-bit display data or 8-bit parameter (D8 to D0)

↓

Read 9-bit Display data (D8 to D0)

9-bit Parallel

↓

Read 8-bit parameter or status (D7 to D0)

↓

Write 8-bit command (D7 to D0)

↓

Write 18-bit display data or 8-bit parameter (D17 to D0)

↓

Read 18-bit Display data (D17 to D0)

18-bit Parallel

↓

Read 8-bit parameter or status (D7 to D0)

Note: applied for command code: DAh, DBh, DCh, 04h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh.

9.3.1 Write cycle sequence

The write cycle means that the host writes information (command or/and data) to the display via the interface. Each write

cycle (E low-high-low sequence) consists of 3 control signals (D/CX, E, R/WX) and data signals (D[17:0]). D/CX bit is a

control signal, which tells if the data is a command or a data. The data signals are the command if the control signal is low

(=’0’) and vice versa it is data (=’1’).

Fig. 9.3.1 6800-Series Write Protocol

Note: E is an unsynchronized signal (It can be stopped)

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