WP1602A-Y-JCS

The LCD display Module of the WP1602A-Y-JCS is built in a LSI controller, the controller has two 8-bit registers, an instruction register (IR) and a data register (DR).

The IR stores instruction codes of the WP1602A-Y-JCS, such as display clear and cursor shift, and address information
for display data RAM (DDRAM) and character generator (CGRAM). The IR can only be written from the MPU. The DR temporarily stores data to be written or read from DDRAM or CGRAM. When address information is written into the IR, then data is stored into the DR from  DDRAM or CGRAM. By the register selector (RS) signal, these two registers can be selected.