SED1565 EPSON [Epson Company], SED1565 Datasheet - Page 49

• Manufacturer Part Number: SED1565
• Description: Direct display of RAM data through the display data RAM
• Manufacturer: EPSON [Epson Company]

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.
2.
3.
4.
5.
6.
7.
8.
9.
10. Output conditions of SEG and COM terminals
11. Read modify write OFF
12. Static indicator OFF
13. Display start line set to first line
14. Column address set to Address 0
15. Page address set to Page 0
16. Common output status normal
17. V
18. Electronic volume register set mode clear
19. Test mode clear
Display OFF
Normal display
ADC select: Normal (ADC command D0 = “L”)
Power control register: (D2, D1, D0) = (0, 0, 0)
Serial interface internal register data clear
LCD power supply bias rate:
All-indicator lamps-on OFF (All-indicator lamps
ON/OFF command D0 = “L”)
Power saving clear
V
separation
(In case of SED1565D
SED1567D
internal resistors are connected while RES is “L.”)
SEG : V
(In case of SED1565D
SED1567D
both the SEG terminal and the COM terminal
output the VDA level while RES is “L.” In case of
other models, the SEG terminal outputs V
COM terminal outputs V
Static indicator register : (D1, D2) = (0, 0)
clear
Electronic volume register : (D5, D4, D3, D2, D1,
D0) = (1, 0. 0, 0, 0, 0)
5
5
voltage regulator internal resistor ratio set mode
voltage regulator internal resistors Ra and Rb
SED1565*
SED1566*
SED1567*
2
/V
BB
BB
3
,
, SED1568D
, SED1568D
** ...............................................
**
** ...............................................
COM : V
, 1568*
1
**
1
while RES is “L.”)
BB
/V
BB
, 1569*
BB
BB
4
and SED1569D
and SED1569D
, SED1566D
, SED1566D
** .......
2
1/9 bias
1/8 bias
1/6 bias
and the
BB
BB
BB
BB
EPSON
,
,
,
,
On the other hand, when the reset command is used, the
above default settings from 11 to 19 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 overcurrent 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 SED1565D
SED1568D
RES is “H” when the external liquid crystal power
supply is turned on.
discharge V
supply short-circuits to V
While RES is “L,” the oscillator and the display timing
generator stop, and the CL, FR, FRS and DOF terminals
are fixed to “H.” The terminals D0 to D7 are not
affected. The V
COM output terminals. This means that an internal
resistor is connected between V
When the internal liquid crystal power supply circuit is
not used on other models of SED1565 series, it is
necessary that RE is “L” when the external liquid crystal
power supply is turned on.
While RES is “L,” the oscillator works but the display
timing generator stops, and the CL, FR, FRS and DOF
terminals are fixed to “H.” The terminals D0 to D7 are
not affected.
BB
5
when RES is “L,” and the external power
and SED1569D
DD
BB
level is output from the SEG and
, SED1566D
This IC has the function to
DD
when RES is “L.”
BB
DD
SED1565 Series
, it is necessary that
and V
BB
, SED1567D
5
.
8–47
BB
,