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ST7066U View Datasheet(PDF) - Unspecified

Part NameST7066U Unspecified1
DescriptionDot Matrix LCD Controller/Driver

ST7066U Datasheet PDF : 42 Pages
First Prev 21 22 23 24 25 26 27 28 29 30 Next Last
n 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.
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 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.
Ø Example of busy flag check timing sequence
R /W
In te rn a l
o p e ra tio n
D e la y
(> 8 0 u s )
F u n c tio n in g
IR 7
IR 3
In s tru c tio n w rite
B u s y fla g c h e c k
N ot
B u s y fla g c h e c k
IR 7
IR 3
In s tru c tio n w rite
Ø Intel 8051 interface
COM1 to COM16
P1.0 to P1.3
DB4 to DB7
Intel 8051 Serial
E SEG1 to SEG40 40
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[Sitronix Technology Co., Ltd.]

The ST7066U dot-matrix liquid crystal display controller and driver LSI displays alphanumeric, Japanese kana characters, and symbols. It can be configured to drive a dot-matrix liquid crystal display under the control of a 4-or8-bit microprocessor. Since all the functions such as display RAM, character  generator,  and  liquid  crystal  driver,  required fordriving a dot-matrix liquid crystal display are internally provided on one chip,  a minimal system can be interfaced with this controller/driver.

● 5 x 8 and 5 x 11 dot matrix possible
● Low power operation support:
   -- 2.7 to 5.5V
● Wide range of LCD driver power
   -- 3.0 to 10V
● Correspond to high speed MPU bus
   -- 2 MHz (when VCC = 5V)
● 4-bit or 8-bit MPU interface enabled
● 80 x 8-bit display RAM (80 characters max.)
● 13,200-bit character generator ROM for a
   total of 240 character fonts(5 x 8 dot or 5 x 11
● 64 x 8-bit character generator RAM
   -- 8 character fonts (5 x 8 dot)
   -- 4 character fonts (5 x 11 dot)
● 16-common x 40-segment liquid crystal
   display driver
● Programmable duty cycles
   -- 1/8 for one line of 5 x 8 dots with cursor
   -- 1/11 for one line of 5 x 11 dots & cursor
   -- 1/16 for two lines of 5 x 8 dots & cursor
● Wide range of instruction functions:
   Display clear, cursor home, display on/off,
   cursor on/off, display character blink, cursor
   shift, display shift
● Automatic reset circuit that initializes the
   controller/driver after power on
● Internal oscillator with external resistors
● Low power consumption
● QFP80 and Bare Chip available

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