ST7032 Datasheet, PDF (35/63 Pages) Sitronix Technology Co., Ltd. – Dot Matrix LCD Controller/Driver

ST7032
n Interfacing to the MPU
The ST7032 can send data in two 4-bit operations/one 8-bit operation, serial 1 bit operation or fast I²C operation,
thus allowing interfacing with 4-bit, 8-bit or I²C MPU.
l 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 ST7032 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.
Ø Example of busy flag check timing sequence
CSB
RS
R/W
E
Internal
operation
Functioning
DB7
IR7 IR3
AC3
Instruction write Busy flag check
Not
Busy
AC3
Busy flag check
IR7 IR3
Instruction write
Ø Intel 8051 interface(4 Bit)
16
COM1 to COM16
P1.0 to P1.3
4
DB4 to DB7
P3.0
P3.1
P3.2
P3.3
Intel 8051 Serial
RS
R/W
E _{SEG1 to SEG80} 80
CSB
ST7032
V1.4
35/61
2008/08/18