PT6880 Datasheet, PDF (25/42 Pages) Princeton Technology Corp – OLED Driver/Controller IC

OLED Driver/Controller IC
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Preliminary
PT6880
instruction when using the Cursor Shift Instruction to shift the cursor (Reading the DDRAM). The
Cursor Shift Instruction has the same operation as that of the Set the DDRAM Address Instruction.
After a Read instruction has been executed, the Entry Mode is automatically incremented or
decremented by 1 . It must be noted that regardless of the Entry Mode, the Display Shift is not
executed.
After the Write instructions to either the CGRAM or DDRAM has been performed, the Address
Counter is automatically increased or decreased by 1. The RAM data selected by the Address
Counter cannot be read out at this time even if the Read Instructions are executed. Therefore, in order
to correctly read the data, the following procedure has suggested:
1. Execute the Address Set or Cursor Shift (only with DDRAM) Instruction
2. Just before reading the desired data, execute the Read Instruction from the second time the
Read Instruction has been sent.
MPU Interface
PT6880 can be configured to interface with either the 4-bit or 8-bit MPU via the DB0 to DB7 pins.
8-BIT MPU INTERFACE
When PT6880 interfaces with an 8-bit MPU, DB0 to DB7 are used. The 8-bit data transfer starts
from the four high order bits --DB4 to DB7 followed by the four low order bits -- DB0 to DB3.
An example of a Busy Flag Check Timing in an 8-Bit MPU Interface is given in the diagram below.
PT6880 pre 1.1
Page 25
Mar. 2002