參數(shù)資料
型號(hào)： KS0074
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： 34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
中文描述： 34COM/80SEG驅(qū)動(dòng)
文件頁(yè)數(shù)： 8/70頁(yè)
文件大小： 537K
代理商： KS0074
KS0074 34COM/80SEG 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.
Hence, 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").
Table 2. Various kinds of operations according to RS and R/W bits.
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)
Busy Flag (BF)
When BF = "High", it indicates that the internal operation is being processed. So during this time the next instruction cannot be
accepted. BF can be read, when RS = Low and R/W = High(Read Instruction Operation), through DB7 port.
Before executing the next instruction, be sure that BF is not High.
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