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SA8807APA

96 SEGMENT LIQUID CRYSTAL DISPLAY DRIVER SERIAL (SPI) INTERFACE

South African Micro Electronic Systems 

SA8807A

Diagram 2: LCD Driving Signals

4. LCD Character Mapping

The device contains 12 x 8 bit display memory. Each byte is divided into 2 x 4 bits,

for driving two adjacent segment outputs.

The lower four bits (3, 2, 1 & 0) contain the data for segments VS[0], VS[2], ......

VS[20] and VS[22]. The upper four bits (7, 6, 5 & 4) contain the data segments

VS[1], VS[3], ...... VS[21] and VS[23].

SEG VS[0] VS[1] VS[2] VS[3] ........ VS[20] VS[21] VS[22] VS[23]

VR[0] 0-0 0-4* 1-0 1-4

........ 10-0 10-4 11-0 11-4

VR[1] 0-1 0-5 1-1 1-5

........ 10-1 10-5 11-1 11-5

VR[2] 0-2 0-6 1-2 1-6

........ 10-2 10-6 11-2 11-6

VR[3] 0-3 0-7 1-3 1-7

........ 10-3 10-7 11-3 11-7

Note: A '1' switches the corresponding segment on.

* The address number and bit number of the byte is given, e.g. 0-4 is address 0 and

bit 4 (LSB).

In 3-backplane mode, data corresponsing to VR[3] (bit 3 and 7) is unused.

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