S6A0075 Datasheet, PDF (10/70 Pages) Samsung semiconductor – 100 SEG / 34 COM DRIVER & CONTROLLER FOR DOT MATRIX LCD

S6A0075
100 SEG / 34 COM DRIVER & CONTROLLER FOR DOT MATRIX LCD
FUNCTION DESCRIPTION
SYSTEM INTERFACE
This chip has all three kinds interface type with MPU: serial, 4-bit bus and 8-bit bus. Serial and bus (4-bit/8-bit) is
selected by IM input, and 4-bit bus and 8-bit bus is selected by DL bit in the instruction register. During read or
write operation, two 8-bit registers are used. one is data register (DR), the other is instruction register (IR). The
data register (DR) is used as temporary data storage place for being written into or read from
DDRAM/CGRAM/SEGRAM, target RAM is selected by RAM address setting instruction. Each internal operation,
reading from or writing into RAM, is done automatically. So to speak, after MPU reads DR data, the data in the
next DDRAM/CGRAM/SEGRAM address is transferred into DR automatically. Also after MPU writes data to DR,
the data in DR is transferred into DDRAM/CGRAM/SEGRAM automatically. The Instruction register (IR) is used
only to store instruction code transferred from MPU. MPU cannot use it to read instruction data. To select
register, use RS/CS input pin in 4-bit/8-bit bus mode (IM = "High") or RS bit in serial mode (IM = "Low").
RS
R/W
Operation
0
0
Instruction write operation (MPU writes Instruction code into IR)
0
1
Read busy flag (DB7) and address counter (DB0 - DB6)
1
0
Data write operation (MPU writes data into DR)
1
1
Data read operation (MPU reads data from DR)
10