PT6880 Datasheet, PDF (26/42 Pages) Princeton Technology Corp – OLED Driver/Controller IC

OLED Driver/Controller IC
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Preliminary
PT6880
4-BIT MPU INTERFACE
PT6880 can be configured to interface with a 4-bit MPU and is selected via a program. If the I/O port
of the 4-Bit MPU from which PT6880 is connected to, is capable of transferring 8 bits, then an 8-bit
data transfer operation is executed. Otherwise, two 4-bit data transfer operations are needed to
satisfy one complete data transfer.
Under the 4-bit data transfer, DB4 to DB7 are used as bus lines. DB0 to DB3 are disabled. The data
transfer between PT6880 and MPU is completed after two 4-bit data have been transferred. The
Busy Flag must be checked (one instruction) after completion of the data transfer (that is, 4-bit data
has been transferred twice.). The Busy Flag must be checked after two 4-bits data transfer has been
completed. Please refer to the diagram below for a 4-bit data transfer timing sequence.
Where: 1. IR7 = Instruction Bit 7
2. IR3 = Instruction Bit 3
3. AC3 = Address Counter 3
From the above timing diagram, it is important to note that the Busy Flag Check and the data transfer
are both executed twice.
PT6880 pre 1.1
Page 26
Mar. 2002