ST7565V Sitronix Technology, ST7565V Datasheet - Page 41

• Manufacturer Part Number: ST7565V
• Description: 65 x 132 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7565V
The Reset Circuit
When the /RES input comes to the “L” level, these LSIs
return to the default state. Their default states are as follows:
1. Display OFF
2. Normal display
3. ADC select: Normal (ADC command D0 = “L”)
4. Power control register: (D2, D1, D0) = (0, 0, 0)
5. Serial interface internal register data clear
6. LCD power supply bias rate:
7. All-indicator lamps-on OFF (All-indicator lamps ON/OFF
8. Power saving clear
9. V
10. Output conditions of SEG and COM terminals
11. Read modify write OFF
12. Display start line set to first line
13. Column address set to Address 0
14. Page address set to Page 0
15. Common output status normal
16. V
17. Electronic volume register set mode clear Electronic
Ver 1.5b
( D 5 , D 4 , D 3 , D 2 , D 1 , D 0 ) = ( 1 , 0 . 0 , 0 , 0 , 0 )
1/65 DUTY = 1/9 bias
1/49,1/55,1/53 DUTY = 1/8 bias
1/33 DUTY = 1/6 bias
command D0 = “L”)
separation
SEG=VDD , COM=VDD
volume register :
5
5
voltage regulator internal resistor ratio set mode clear
voltage regulator internal resistors Ra and Rb
41/72
18. Test mode clear
On the other hand, when the reset command is used, the
above default settings from 11 to 18 are only executed.
When the power is turned on, the IC internal state becomes
unstable, and it is necessary to initialize it using the /RES
terminal. After the initialization, each input terminal should
be controlled normally.
Moreover, when the control signal from the MPU is in the
high impedance, an over current may flow to the IC. After
applying a current, it is necessary to take proper measures
to prevent the input terminal from getting into the high
impedance state.
If the internal liquid crystal power supply circuit is not used
on ST7565V,it is necessary that /RES is “H” when the
external liquid crystal power supply is turned on. This IC has
the function to discharge V
external power supply short-circuits to V
This means that an internal resistor is connected between
V
While /RES is “L,” the oscillator works but the display timing
generator stops, and the CL, FR and /DOF terminals are
fixed to “H.” The terminals D0 to D7 are not affected. The
V
after a successful hardware reset.
DD
DD
and V
level is output from the SEG and COM output terminals
5
.
5
when /RES is “L,” and the
DD
when /RES is “L.”
2009/09/14