Displaytech 161G BC BW

This LCD module incorporates an LSI controller containing two 8-bit registers: an Instruction Register (IR) and a Data Register (DR). The IR stores instruction codes (such as display clear and cursor shift) as well as address information for the Display Data RAM (DDRAM) and Character Generator RAM (CGRAM). The IR can only be written by the microprocessor. The DR temporarily stores data to be written to or read from DDRAM and CGRAM. When address information is written to the IR, data is transferred from DDRAM or CGRAM into the DR. These two registers are selected via the Register Select (RS) signal. When the busy flag is 1, the LSI controller is in internal operation mode and will not accept the next instruction. When RS=0 and R/W=1, the busy flag is output to DB7. The next instruction must not be written until the busy flag is confirmed to be 0. The Address Counter (AC) assigns addresses to both DDRAM and CGRAM. DDRAM stores display data as 8-bit character codes, with an extended capacity of 80×8 bits, accommodating up to 80 characters. The Character Generator ROM generates 5×8-dot or 5×10-dot character patterns from 8-bit character codes. In the Character Generator RAM, users can reprogram character patterns. Up to 8 character patterns can be written for the 5×8-dot format, and up to 4 for the 5×10-dot format. Character patterns stored in CGRAM are displayed by writing the corresponding character codes at the addresses shown in the left column of Table 1 into DDRAM.