ST7735
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
1
IM1
0
IM0
0
Interface
D/CX
0
RDX
1
WRX
Read back selection
Write 8-bit command (D7 to D0)
↑
↑
1
1
↑
↑
1
1
↑
↑
1
1
↑
↑
1
1
8-bit
1
1
Write 8-bit display data or 8-bit parameter (D7 to D0)
Read 8-bit display data (D7 to D0)
parallel
1
↑
1
↑
Read 8-bit parameter or status (D7 to D0)
Write 8-bit command (D7 to D0)
0
1
16-bit
1
1
Write 16-bit display data or 8-bit parameter (D15 to D0)
Read 16-bit display data (D15 to D0)
1
1
1
0
1
1
1
0
1
parallel
1
↑
1
↑
Read 8-bit parameter or status (D7 to D0)
Write 8-bit command (D7 to D0)
0
1
9-bit
1
1
Write 9-bit display data or 8-bit parameter (D8 to D0)
Read 9-bit display data (D8 to D0)
parallel
1
↑
1
↑
Read 8-bit parameter or status (D7 to D0)
Write 8-bit command (D7 to D0)
0
1
18-bit
1
1
Write 18-bit display data or 8-bit parameter (D17 to D0)
Read 18-bit display data (D17 to D0)
parallel
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
V1.7
26
2009-12-04
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
