ST7036-0A ETC [List of Unclassifed Manufacturers], ST7036-0A Datasheet - Page 45

• Manufacturer Part Number: ST7036-0A
• Description: Dot Matrix LCD Controller/Driver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

ST7036
The ST7036 can send data in two 4-bit operations/one 8-bit operation, serial 1 bit operation or fast
thus allowing interfacing with 4-bit, 8-bit or
V1.1
Interfacing to the MPU
For 4-bit interface data, only four bus lines (DB4 to DB7) are used for transfer. Bus lines DB0 to DB3
are disabled. The data transfer between the ST7036 and the MPU is completed after the 4-bit data has been
transferred twice. As for the order of data transfer, the four high order bits (for 8-bit operation, DB4 to DB7)
are transferred before the four low order bits (for 8-bit operation, DB0 to DB3). The busy flag must be
checked (one instruction) after the 4-bit data has been transferred twice. Two more 4-bit operations then
transfer the busy flag and address counter data.
Example of busy flag check timing sequence
Intel 8051 interface(4 Bit)
operation
Internal
CSB
R/W
DB7
RS
E
Intel 8051 Serial
P1.0 to P1.3
Instruction write
IR7
P3.0
P3.1
P3.2
P3.3
IR3
I
2
C
MPU.
Busy flag check
Functioning
4
45/72
AC3
DB4 to DB7
RS
R/W
E
CSB
ST7036
Busy flag check
Busy
Not
SEG100/80
COM16/24
COM1 to
SEG1 to
AC3
100/80
16/24
Instruction write
IR7
IR3
I
2
C
operation,
2003/12/24