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Commands Descriptions

The host microcontroller can issue commands to the SBN1661G_X. Table 27 lists all the

commands. When issuing a command, the host microcontroller should put the command code

on the data bus. The host microcontroller should also give the control bus C/D, E(RD), and

R/W(WR) proper value and timing.

Commands

Write Display Data

The Write Display Data command writes a byte (8 bits) of data to the Display Data Memory.

Data is put on the data bus by the host microcontroller. The location which accepts this byte of

data is pointed to by the Page Address Register and the Column Address Register. At the end of

the command operation, the content of the Column Address Register is automatically

incremented by 1.

The setting of the control bus for issuing Write Display Data command

Read Display Data

The Read Display Data command starts a 3-step operation.

1. First, the current data of the internal 8-bit output latch of the Display Data Memory is read by

the

microcontroller, via the 8-bit data bus DB0~DB7.

2. Then, a byte of data of the Display Data Memory is transferred to the 8-bit output latch from a

location specified by the Page Address Register and the Column Address Register.

3. Finally, the content of the Column Address Register is automatically incremented by one.

Follow figure shows the internal 8-bit ouptut latch located between the 8-bit I/O data bus and

the Display Data Memory cell array. Because of this internal 8-bit output latch, a dummy read

is needed to obtain correct data from the Display Data Memory. For Display Data Write

operation, a dummy write is not needed, because data can be directly written from the data

bus to internal memory cells.

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