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PC0801ARS-F Datenblatt(PDF) 50 Page - Powertip Technology

Teilenummer PC0801ARS-F
Bauteilbeschribung  OUTLINE DIMENSION & BLOCK DIAGRAM
PDF  65 Pages
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PC0801ARS-F Datenblatt(HTML) 50 Page - Powertip Technology

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ST7066U
V2.0
2001/03/01
27/42
!"
Interfacing to the MPU
The ST7066U can send data in either two 4-bit operations or one 8-bit operation, thus allowing interfacing with 4-
or 8-bit 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 ST7066U 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
P1.0 to P1.3
P3.0
P3.1
P3.2
RS
R/W
E
DB4 to DB7
COM1 to COM16
SEG1 to SEG40
40
16
Intel 8051 Serial
ST7066U
4
Functioning
DB7
Internal
operation
E
R/W
RS
Busy flag check
Busy flag check
Instruction write
Instruction write
IR7
IR3
AC3
Not
Busy
AC3
IR3
IR7



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