NJU6680 Datasheet, PDF (34/56 Pages) New Japan Radio – 128-common x 128-segment 4-level Gray Scale BITMAP LCD DRIVER

NJU6680
(b) 3-line serial interface
In the 3-line serial interface mode, the “Display data length set” instruction is used to specify the
data length in between 1 and 256 bytes for the display data transferred to the DDRAM. The “Display
data length set” instruction is executed by 2 bytes data, after which the display data can be
continuously transferred. The next transferred data after the display data is distinguished as
instruction data. Fig 8-2 illustrates the timing and setting example for the data transmission in the
3-line serial interface mode.
When the chip select becomes non-active (CS=“1”) during a serial display data stream, the
interrupted byte data is invalid, however all previous transferred display data is valid and next
transferred data will be distinguished as instruction data.
CS
Page address sets
Column address set
3 bytes
Display data length set
(Dual instructions)
2 bytes
SI
Page
MSB
LSB
SCL
0 7 8 15 16 23 0 7 8 15 0
Display data write
1 – 256 bytes
Display data
• The setting example for the data transmission in the 3-line serial interface mode.
Page address set
↓
(1, 0, 1, 1, P3, P2, P1, P0)
Column address LSB set: (0, 0, 0, 1, 0, C6, C5, C4)
Column address MSB set
↓
(0, 0, 0, 0, C3, C2, C1, C0)
Display data length set (dual instructions)
Set display data length
(1, 1, 1, 0, 1, 0, 0, 0)
Specify the data length
↓
(D7, D6, D5, D4, D3, D2, D1, D0)
Display data write
Fig 8-2 3-line serial interface timing
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Ver.2003-04-08