SPFD54124B Drise, SPFD54124B Datasheet - Page 113

• Manufacturer Part Number: SPFD54124B
• Description: 396-Channel 6-Bit Source Driver
• Manufacturer: Drise

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7.2.3.
The MCU uses a 11-wires 8-data parallel interface or 19-wires 16-data parallel interface or 12-wires 9-data parallel interface or 21-wires
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.
The Graphics Controller Chip 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 chip. The selection of
this interface is done when P68 pin is high state (VDDIO). Interface bus width can be selected with IM2, IM1 and IM0.
The interface functions of 6800-series parallel interface are given in Table 7.2.3.
Table 7.2.3 The function of 6800-series parallel interface
7.2.3.1 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 (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’).
Note: E is an unsynchronized signal (It can be stopped)
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P68 IM2 IM1 IM0
1
1
1
1
1
1
1
1
6800-Series Parallel Interface (P68=’1’)
0
0
1
1
D[17:0]
R/WX
0
1
0
1
E
The host starts to
control D[17:0] lines
when there is a rising
edge of the E
Interface
Parallel
Parallel
Parallel
Parallel
16-bits
18-bits
‘0’
8-bits
9-bits
Fig. 7.2.3.1.1 6800-Series Write Protocol
D/CX
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
R/WX
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
The display writes
D[17:0] lines when
there is a falling edge
of the E
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
E
Write 8-bits command (D7 to D0)
Write 8-bits display data or 8-bits parameter (D7 to D0)
Read 8-bits command (D7 to D0)
Read 8-bits parameter or status (D7 to D0)
Write 8-bits command (D7 to D0)
Write 16-bits display data (D15 to D0) or 8-bits parameter (D7 to D0)
Read 8-bits command (D7 to D0)
Read 8-bits parameter or status (D7 to D0)
Write 8-bits command (D7 to D0)
Write 9-bits display data (D8 to D0) or 8-bits parameter (D7 to D0)
Read 8-bits command (D7 to D0)
Read 8-bits parameter or status (D7 to D0)
Write 8-bits command (D7 to D0)
Write 18-bits display data (D17 to D0) or 8-bits parameter (D7 to D0)
Read 8-bits command (D7 to D0)
Read 8-bits parameter or status (D7 to D0)
113
The host stops to
control D[17:0] lines
Function
SPFD54124B
Preliminary
Preliminary Version: 0.6
APR. 26, 2007