ST7715 View Datasheet(PDF) - Sitronix Technology Co., Ltd.
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MFG CO.
'ST7715' PDF : 167 Pages View PDF
ST7715
9.2 8080-series MCU parallel interface
The MCU can use one of following interfaces: 11-lines with 8-data parallel interface, 12-lines with 9-data parallel interface,
19-line with 16-data parallel interface or 21-lines with 18-data parallel interface. The chip-select CSX (active low)
enables/disables the parallel interface. RESX (active low) is an external reset signal. WRX is the parallel data write enable,
RDX is the parallel data read enable and D[17:0] is parallel data bus.
The LCD driver reads the data at the rising edge of WRX signal. The D/CX is the data/command flag. When D/CX=’1’,
D[17:0] bits is either display data or command parameter. When D/C=’0’, D[17:0] bits is command.
The interface functions of 8080-series parallel interface are given in following table.
IM2 IM1 IM0 Interface D/CX RDX WRX
Read back selection
0
1
↑
Write 8-bit command (D7 to D0)
8-bit
1
1
↑
1
0
0
parallel
1
↑
1
Write 8-bit display data or 8-bit parameter (D7 to D0)
Read 8-bit display data (D7 to D0)
1
↑
1
Read 8-bit parameter or status (D7 to D0)
0
1
↑
Write 8-bit command (D7 to D0)
16-bit
1
1
↑
1
0
1
parallel
1
↑
1
Write 16-bit display data or 8-bit parameter (D15 to D0)
Read 16-bit display data (D15 to D0)
1
↑
1
Read 8-bit parameter or status (D7 to D0)
0
1
↑
Write 8-bit command (D7 to D0)
9-bit
1
1
↑
1
1
0
parallel
1
↑
1
Write 9-bit display data or 8-bit parameter (D8 to D0)
Read 9-bit display data (D8 to D0)
1
↑
1
Read 8-bit parameter or status (D7 to D0)
0
1
↑
Write 8-bit command (D7 to D0)
18-bit
1
1
↑
1
1
1
parallel
1
↑
1
Write 18-bit display data or 8-bit parameter (D17 to D0)
Read 18-bit display data (D17 to D0)
1
↑
1
Read 8-bit parameter or status (D7 to D0)
Table 9.2.1 the function of 8080-series parallel interface
Note: applied for command code: DAh, DBh, DCh, 04h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
V1.5
26
2009-12-04
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