APPLICATION NOTES - NewHaven Display

User’s Guide
M0216SD-162SDA2
VFD
(Vacuum Fluorescent Display Module)
For product support, contact
Newhaven Display International
2511 Technology Drive #101
Elgin, IL 60124
Tel: (847) 844-8795
Fax: (847) 844-8796
March 5, 2008
Newhaven Display International
M0216SD-162SDA2
1.0 SCOPE
This specification applies to VFD module (Model NO: M0216SD-162SDA2) .
2.0 FEATURES
*Since a DC/DC converter is used, only +5Vdc power source is required to operate the module.
*5x8 dot matrix display, DC-DC/AC converter, and controller/driver circuitry.
*High quality display and luminance.
*ASCII and Japanese characters (CG-ROM font).
*The module can be configured for a Motorola M68-type parallel interface, an Intel I80-type parallel
interface, or synchronous serial ainterface.
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3.0 SPECIFICATIONS
3.1 GENERAL SPECIFICATIONS
ITEM
Number of characters (char x line)
Character configuration
Character height (mm)
Character width (mm)
Character pitch (mm)
Line pitch (mm)
width
Dot size (mm)
height
width
Dot pitch (mm)
height
Peak wavelength of illumination
min.
Luminance (cd/m2 / fL)
typ.
STANDARD
NAME
VALUE
16 x 2
5 x 8 dot matrix
5.34
2.10
3.30
6.16
0.34
0.58
0.44
0.68
Green (505 nm) x = 0.235, y = 0.405
350 / 102
500 / 146
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3.2 MECHANICAL DRAWINGS
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3.3 SYSTEM BLOCK DIAGRAM
NC_RST/_SI/SO
VACUUM
DOT MATRIX
RS_STB
VFD
R/W_WR/
FLUORESCENT
CONTROLLER
E_RD/_SCK
GRID
AND DRIVER
DB0-DB7
DRIVER
DISPLAY
(IF NEEDED)
(SEE SECTION 2.0)
Vcc
DC-DC/AC
CONVERTER
GND
3.4 ENVIRONMENTAL SPECIFICATIONS
Item
Operating temperature
Storage temperature
Operating humidity
Storage humidity
Symbol
Topr
Tstg
Hopr
Hstg
Min.
-40
-50
20
20
Max.
+85
+85
85
90
Unit
o
C
o
C
%RH
%RH
Vibration
--
--
4
G
Shock
--
--
40
G
Comment
Without condensation
Without condensation
Total amplitude: 1.5mm
Freq: 10 - 55 Hz sine wave
Sweep time: 1 min./cycle
Duration: 2 hrs./axis (X,Y,Z)
Duration: 11ms
Waveform: half sine wave
3 times/axis (X,Y,Z,-X,-Y,-Z)
3.5 ABSOLUTE MAXIMUM SPECIFICATIONS
Item
Supply voltage
Input signal voltage
STANDARD
NAME
Symbol
VCC
VIN
Min.
-0.3
-0.3
Max.
6.5
VCC+0.3
Unit
V
V
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3.6 DC ELECTRICAL SPECIFICATIONS
Item
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
VCC
4.5
5.0
5.5
V
Supply current
ICC
-
170
220
mA
High-level input voltage (see Note)
VIH1 0.8*VCC
VCC
(E,RD/,SCK,RST/)
Low-level input voltage (see Note)
VIL1
0.0
0.2*VCC
(E,RD/,SCK,RST/)
High-level input voltage (see Note)
VIH2 0.7*VCC
VCC
(all inputs except E,RD/,SCK,RST/)
Low-level input voltage (see Note)
VIL2
0.0
0.3*VCC
(all inputs except E,RD/,SCK,RST/)
High-level output voltage
VOH VCC-0.5
(IOH = -0.1mA)
Low-level output voltage
VOL
0.5
(IOL = 0.1mA)
Input current (see Note)
II
-500
1.0
Note: A 10K ohm pull-up resistor is provided on each input for TTL compatibility.
V
V
V
V
V
V
uA
3.7 AC ELECTRICAL SPECIFICATIONS
3.7.1 RESET TIMING
(See Figures 1 and 2)
Item
Symbol
Min.
Max.
VCC rise time
tRVCC
10
VCC off time
tOFF
1
Delay time after power-up reset
tIRSTD
100
Delay time after external reset
tERSTD
100
RST/ pulse width low
tRSTL
500
Input signal fall time
tf
15
Input signal rise time
tr
15
Note: All timing is specified using 20% and 80% of VCC as the reference points.
STANDARD
NAME
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ms
ms
us
us
ns
ns
ns
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t RVCC
4.5V
Vcc
0.2V
t OFF
t IRSTD
RS, STB
Figure 1. Power-up Internal Reset Timing
tf
tr
RST/
t RSTL
t ERSTD
RS, STB
Figure 2. External Reset Timing
3.7.2 MOTOROLA M68-TYPE PARALLEL INTERFACE TIMING
(See Figures 3 and 4)
Item
Symbol
Min.
Max.
RS, R/W setup time
tAS
20
RS, R/W hold time
tAH
10
Input signal rise time
tr
15
Input signal fall time
tf
15
E pulse width high
PWEH
230
E pulse width low
PWEL
230
Write data setup time
tDS
80
Write data hold time
tDH
10
E cycle time
tCYCE
500
Read data delay time
tDD
160
Read data hold time
tDHR
5
Note: All timing is specified using 20% and 80% of VCC as the reference points.
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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STANDARD
NAME
M0216SD-162SDA2
RS
t AS
tAH
R/W
tr
tf
PW
EH
E
PW
t DS
EL
tDH
DB0-DB7
t CYCE
Figure 3. Motorola M68-Type Parallel Interface Write Cycle Timing
RS
t AS
tAH
R/W
tr
tf
PW
EH
E
PW
t DD
EL
t DHR
DB0-DB7
t CYCE
Figure 4. Motorola M68-Type Parallel Interface Read Cycle Timing
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3.7.3 INTEL I80-TYPE PARALLEL INTERFACE TIMING
(See Figures 5 and 6)
Item
Symbol
Min.
Max.
RS setup time
tRSS
10
RS hold time
tRSH
10
Input signal fall time
tf
15
Input signal rise time
tr
15
WR/ pulse width low
tWRL
30
WR/ pulse width high
tWRH
100
Write data setup time
tDSi
30
Write data hold time
tDHi
10
WR/ cycle time
tCYCWR
166
RD/ cycle time
tCYCRD
166
RD/ pulse width low
tRDL
70
RD/ pulse width high
tRDH
70
Read data delay time
tDDi
70
Read data hold time
tDHRi
5
50
Note: All timing is specified using 20% and 80% of VCC as the reference points.
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
RS
t RSS
tf
t RSH
tr
t WRH
WR/
t WRL
t DHi
t DSi
DB0-DB7
t CYCWR
Figure 5. Intel I80-Type Parallel Interface Write Cycle Timing
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RS
t RSS
tf
t RSH
tr
t RDH
RD/
t RDL
t DDi
t DHRi
DB0-DB7
t CYCRD
Figure 6. Intel I80-Type Parallel Interface Read Cycle Timing
3.7.4 SYNCHRONOUS SERIAL INTERFACE TIMING
(See Figures 7, 8 and 12)
Item
Symbol
Min.
Max.
STB setup time
tSTBS
100
STB hold time
tSTBH
500
Input signal fall time
tf
15
Input signal rise time
tr
15
STB pulse width high
tWSTB
500
SCK pulse width high
tSCKH
200
SCK pulse width low
tSCKL
200
SI data setup time
tDSs
100
SI data hold time
tDHs
100
SCK cycle time
tCYCSCK
500
SCK wait time between bytes
tWAIT
1
SO data delay time
tDDs
150
SO data hold time
tDHRs
5
Note: All timing is specified using 20% and 80% of VCC as the reference points.
STANDARD
NAME
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
us
ns
ns
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t WSTB
STB
t CYCSCK
t STBS
t STBH
t SCKH
SCK
tf
tr
t SCKL
t DHs
t DSs
SI/SO
Figure 7. Synchronous Serial Interface Write Cycle Timing
t WSTB
STB
t CYCSCK
t STBS
t STBH
t SCKH
SCK
tf
t SCKL
tr
t DHRs
t DDs
SI/SO
Figure 8. Synchronous Serial Interface Read Cycle Timing
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4.0 MODES OF OPERATION
The following modes of operation are selectable via jumpers (see section 8.0 Jumper Settings).
4.1 PARALLEL INTERFACE MODES
In the parallel interface mode, 8-bit instructions and data are sent between the host and the modules
using either 4-bit nibbles or 8-bit bytes. Nibbles are transmitted high nibble first on DB4-DB7 (DB0DB3 are ignored) whereas bytes are transmitted on DB0-DB7. The Register Select (RS) control signal
is used to identify DB0-DB7 as an instruction (low) or data (high).
4.1.1 MOTOROLA M68-TYPE MODE
This mode uses the Read/Write (R/W) and Enable (E) control signals to transfer information.
Instructions/data are written to the modules on the falling edge of E when R/W is low and are read from
the modules after the rising edge of E when R/W is high.
RS
R/W
E
DB7
IB7
IB3
IB7
IB3
BF= ' 0 '
IB3
DB7
DB3
DB6
IB6
IB2
IB6
IB2
IB6
IB2
DB6
DB2
DB5
IB5
IB1
IB5
IB1
IB5
IB1
DB5
DB1
DB4
IB4
IB0
IB4
IB0
IB4
IB0
DB4
DB0
Write instruction
Write instruction
Read instruction
Write data
Figure 9. Typical 4-Bit Parallel Interface Sequence Using M68-Type Mode
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4.1.2 INTEL I80-TYPE MODE
This mode uses the Read (RD/) and Write (WR/) control signals to transfer information.
Instructions/data are written to the modules on the rising edge of WR/ and are read from the modules
after the falling edge of RD/.
RS
WR/
RD/
DB7
IB7
IB7
BF= ' 0 '
DB7
DB6
IB6
IB6
IB6
DB6
DB0
IB0
IB0
IB0
DB0
Write instruction
Write instruction
Read instruction
Write data
Figure 10. Typical 8-Bit Parallel Interface Sequence Using I80-Type Mode
4.2 SYNCHRONOUS SERIAL INTERFACE MODE
In the synchronous serial interface mode, instructions and data are sent between the host and the
modules using 8-bit bytes. Two bytes are required per read/write cycle and are transmitted MSB first.
The start byte contains 5 high bits, the Read/Write (R/W) control bit, the Register Select (RS) control
bit, and a low bit. The following byte contains the instruction/data bits. The R/W bit determines
whether the cycle is a read (high) or a write (low) cycle. The RS bit is used to identify the second byte
as an instruction (low) or data (high).
This mode uses the Strobe (STB) control signal, Serial Clock (SCK) input, and Serial I/O (SI/SO) line
to transfer information. In a write cycle, bits are clocked into the modules on the rising edge of SCK.
In a read cycle, bits in the start byte are clocked into the modules on the rising edge of SCK. After the
minimum wait time, each bit in the instruction/data byte can be read from the modules after each falling
edge of SCK. Each read/write cycle begins on the falling edge of STB and ends on the rising edge. To
be a valid read/write cycle, the STB must go high at the end of the cycle.
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STB
1
2
3
4
5
6
7
8
9
10
'1'
'1'
'1'
'1'
'1'
R/W
RS
'0'
B7
11
12
13
14
15
16
SCK
SI/SO
B6
B5
Start byte
B4
B3
B2
B1
B0
Instruction / Data
Figure 11. Typical Synchronous Serial Interface Write Cycle
STB
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCK
tWAIT
SI/SO
'1'
'1'
'1'
'1'
'1'
Start byte
R/W
RS
'0'
B7
B6
B5
B4
B3
B2
B1
B0
Instruction / Data
Figure 12. Typical Synchronous Serial Interface Read Cycle
4.3 RESET MODES
The modules are reset automatically at power-up by an internal R-C circuit. However, an external reset
mode can also be selected when using one of the parallel interface modes (this option is not available
when using the synchronous serial interface mode). This mode allows the modules to be reset by setting
the Reset (RST/) input low.
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5.0 CHARACTER FONT TABLES
UPPER
NIBBLE
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
LOWER
NIBBLE
STANDARD
NAME
0000
CG
RAM
(1)
0001
CG
RAM
(2)
0010
CG
RAM
(3)
0011
CG
RAM
(4)
0100
CG
RAM
(5)
0101
CG
RAM
(6)
0110
CG
RAM
(7)
0111
CG
RAM
(8)
1000
CG
RAM
(1)
1001
CG
RAM
(2)
1010
CG
RAM
(3)
1011
CG
RAM
(4)
1100
CG
RAM
(5)
1101
CG
RAM
(6)
1110
CG
RAM
(7)
1111
CG
RAM
(8)
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6.0 FUNCTIONAL DESCRIPTION
6.1 ADDRESS COUNTER (AC)
6.1.1 SINGLE LINE DISPLAYS
The AC stores the address of the data being written to and read from DDRAM or CGRAM. The AC
increments by 1 (overflows from 4FH to 00H) or decrements by 1 (underflows from 00H to 4FH) after
each DDRAM access. The AC increments by 1 (overflows from 3FH to 00H) or decrements by 1
(underflows from 00H to 3FH) after each CGRAM access. When addressing DDRAM, the value in
the AC also represents the cursor position.
6.1.2 MULTIPLE LINE DISPLAYS
The AC stores the address of the data being written to and read from DDRAM or CGRAM. The AC
increments by 1 (overflows from 27H to 40H and from 67H to 00H) or decrements by 1 (underflows
from 40H to 27H and from 00H to 67H) after each DDRAM access. The AC increments by 1
(overflows from 3FH to 00H) or decrements by 1 (underflows from 00H to 3FH) after each CGRAM
access. When addressing DDRAM, the value in the AC also represents the cursor position.
6.2 DISPLAY DATA RAM (DDRAM)
6.2.1 SINGLE LINE DISPLAYS
The DDRAM stores the character code of each character being displayed on the VFD. Valid
DDRAM addresses are 00H to 4FH. DDRAM not being used for display characters can be used as
general purpose RAM. The tables below show the relationship between the DDRAM address and the
character position on the VFD before and after a display shift (with the number of display lines set to 1).
6.2.2 MULTIPLE LINE DISPLAYS
The DDRAM stores the character code of each character being displayed on the VFD. Valid
DDRAM addresses are 00H to 27H and 40H to 67H. DDRAM not being used for display characters
can be used as general purpose RAM. The tables below show the relationship between the DDRAM
address and the character position on the VFD before and after a display shift (with the number of
display lines set to 2).
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6.3 DISPLAY SHIFT DETAIL
Relationship before a display shift (non-shifted):
1
1
2
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
Relationship after a display shift to the left:
1
1
2
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10
41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50
Relationship after a display shift to the right:
1
1
2
STANDARD
NAME
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
27 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E
67 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E
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6.4 CHARACTER GENERATOR RAM (CGRAM)
The CGRAM stores the pixel information (1 = pixel on, 0 = pixel off) for the eight userdefinable 5x8 characters. Valid CGRAM addresses are 00H to 3FH. CGRAM not being used to
define characters can be used as general purpose RAM (lower 5 bits only). Character codes 00H
to 07H (or 08H to 0FH) are assigned to the user-definable characters (see section 5.0 Character
Font Tables). The table below shows the relationship between the character codes, CGRAM
addresses, and CGRAM data for each user-definable character.
Character code
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 X 0 0 0
0
0
0
0
0
0
0
0
X
X
0
1
0
1
1
1
CGRAM address
A5 A4 A3 A2 A1 A0
0 0 0 0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 1 0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
CGRAM data
D7 D6 D5 D4 D3 D2
X X X 1 1 1
0 0 0
0 0 0
0 0 1
0 1 0
1 0 0
1 1 1
0 0 0
X X X 1 1 1
1 0 0
1 0 0
1 1 1
1 0 0
1 0 0
1 1 1
0 0 0
X
X
X
0
1
1
1
1
1
1
0
1
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
D1
1
0
1
0
0
0
1
0
1
0
0
1
0
0
1
0
D0
1
1
0
0
0
0
1
0
1
0
0
0
0
0
1
0
1
0
0
0
0
0
0
1
0
1
0
0
0
0
1
0
CGRAM
(1)
CGRAM
(2)
CGRAM
(8)
x = don't care
6.5 INSTRUCTIONS
Instruction
Clear display
Cursor home
Entry mode set
Display on/off control
Cursor/display shift
Function set
CGRAM address set
DDRAM address set
Address counter read
DDRAM or CGRAM write
DDRAM or CGRAM read
x = don’t care
STANDARD NAME:
RS
0
0
0
0
0
0
0
0
0
1
1
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
x
0
0
0
0
0
0
1
I/D
S
0
0
0
0
0
1
D
C
B
0
0
0
0
1
S/C R/L
x
x
0
0
0
1
DL
N
x
BR1 BR0
0
0
1
CGRAM address
0
1
DDRAM address
1 BF=0
AC contents
0
Write data
1
Read data
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6.5.1 CLEAR DISPLAY
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
0
1
This instruction clears the display (without affecting the contents of CGRAM) by performing the
following:
1)
2)
3)
4)
Fills all DDRAM locations with character code 20H (character code for a space).
Sets the AC to DDRAM address 00H (i.e. sets cursor position to 00H).
Returns the display to the non-shifted position.
Sets the I/D bit to 1.
6.5.2 CURSOR HOME
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
0
1
x
x = don’t care
This instruction returns the cursor to the home position (without affecting the contents of DDRAM or
CGRAM) by performing the following:
1) Sets the AC to DDRAM address 00H (i.e. sets cursor position to 00H).
2) Returns the display to the non-shifted position.
6.5.3 ENTRY MODE SET
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
1
I/D
S
This instruction selects whether the AC (cursor position) increments or decrements after each DDRAM
or CGRAM access and determines the direction the information on the display shifts after each
DDRAM write. The instruction also enables or disables display shifts after each DDRAM write
(information on the display does not shift after a DDRAM read or CGRAM access). DDRAM,
CGRAM, and AC contents are not affected by this instruction.
I/D = 0: The AC decrements after each DDRAM or CGRAM access. If S = 1, the information on
the display shifts to the right by one character position after each DDRAM write.
I/D = 1: The AC increments after each DDRAM or CGRAM access. If S = 1, the information on the
display shifts to the left by one character position after each DDRAM write.
S = 0:
S = 1:
STANDARD
NAME
The display shift function is disabled.
The display shift function is enabled.
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6.5.4 DISPLAY ON/OFF CONTROL
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
1
D
C
B
This instruction selects whether the display and cursor are on or off and selects whether or not the
character at the current cursor position blinks. DDRAM, CGRAM, and AC contents are not affected
by this instruction.
D = 0:
D = 1:
The display is off (display blank).
The display is on (contents of DDRAM displayed).
C = 0:
C = 1:
The cursor is off.
The cursor is on (8th row of pixels).
B = 0:
B = 1:
The blinking character function is disabled.
The blinking character function is enabled (a character with all pixels on will alternate with the
character displayed at the current cursor position at about a 1Hz rate with a 50% duty cycle).
6.5.5 CURSOR/DISPLAY SHIFT
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
1
S/C R/L
x
x
x = don’t care
This instruction increments or decrements the AC (cursor position) and shifts the information on the
display one character position to the left or right without accessing DDRAM or CGRAM. DDRAM
and CGRAM contents are not affected by this instruction. If the AC was addressing CGRAM prior to
this instruction, the AC will be addressing DDRAM after this instruction. However, if the AC was
addressing DDRAM prior to this instruction, the AC will still be addressing DDRAM after this
instruction.
S/C
0
0
1
1
STANDARD
NAME
R/L
0
1
0
1
AC contents (cursor position)
Decrements by one
Increments by one
Decrements by one
Increments by one
Information on the display
No change
No change
Shifts one character position to the left
Shifts one character position to the right
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6.5.6 FUNCTION SET
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
1
DL
N
x
BR1 BR0
x = don’t care
This instruction sets the width of the data bus for the parallel interface modes, the number of display
lines, and the luminance level (brightness) of the VFD. It must be the first command sent after any reset.
DDRAM, CGRAM, and AC contents are not affected by this instruction.
DL = 0: Sets the data bus width for the parallel interface modes to 4-bit (DB7-DB4).
DL = 1: Sets the data bus width for the parallel interface modes to 8-bit (DB7-DB0).
N = 0:
N = 1:
Sets the number of display lines to 1 (this setting is not recommended for multiple line
displays).
Sets the number of display lines to 2 (this setting is not recommended for single line displays).
BR1,BR0 = 0,0:
0,1:
1,0:
1,1:
Sets the luminance level to 100%.
Sets the luminance level to 75%.
Sets the luminance level to 50%.
Sets the luminance level to 25%.
6.5.7 CGRAM ADDRESS SET
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
1
CGRAM address
This instruction places the 6-bit CGRAM address specified by DB5-DB0 into the AC (cursor position).
Subsequent data writes (reads) will be to (from) CGRAM. DDRAM and CGRAM contents are not
affected by this instruction.
6.5.8 DDRAM ADDRESS SET
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
1
DDRAM address
This instruction places the 7-bit DDRAM address specified by DB6-DB0 into the AC (cursor position).
Subsequent data writes (reads) will be to (from) DDRAM. DDRAM and CGRAM contents are not
affected by this instruction.
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6.5.9 ADDRESS COUNTER READ
RS
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1 BF=0
AC contents
This instruction reads the current 7-bit address from the AC on DB6-DB0 and the busy flag (BF) bit
(always 0) on DB7. DDRAM, CGRAM, and AC contents are not affected by this instruction. Because
the BF is always 0, the host never has to read the BF bit to determine if the modules are busy before
sending data or instructions. Therefore, data and instructions can be sent to the modules continuously
according to the E, WR/, and SCK cycle times specified in section 3.7 AC Timing Specifications. Due
to this feature, the execution times for each instruction are not specified.
6.5.10 DDRAM OR CGRAM WRITE
RS
1
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
Write data
This instruction writes the 8-bit data byte on DB7-DB0 into the DDRAM or CGRAM location
addressed by the AC. The most recent DDRAM or CGRAM Address Set instruction determines
whether the write is to DDRAM or CGRAM. This instruction also increments or decrements the AC
and shifts the display according to the I/D and S bits set by the Entry Mode Set instruction.
6.5.11 DDRAM OR CGRAM READ
RS
1
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1
Read data
This instruction reads the 8-bit data byte from the DDRAM or CGRAM location addressed by the AC
on DB7-DB0. The most recent DDRAM or CGRAM Address Set instruction determines whether the
read is from DDRAM or CGRAM. This instruction also increments or decrements the AC and shifts
the display according to the I/D and S bits set by the Entry Mode Set instruction. Before sending this
instruction, a DDRAM or CGRAM Address Set instruction should be executed to set the AC to the
desired DDRAM or CGRAM address to be read.
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6.6 RESET CONDITIONS
After either a power-up reset or an external reset, the modules initialize to the following conditions:
1) All DDRAM locations are set to 20H (character code for a space).
2) The AC is set to DDRAM address 00H (i.e. sets cursor position to 00H).
3) The relationship between DDRAM addresses and character positions on the VFD is set to the nonshifted position.
4) Entry Mode Set instruction bits:
I/D = 1: The AC increments after each DDRAM or CGRAM access.
S = 0:
The display shift function is disabled.
5) Display On/Off Control instruction bits:
D = 0:
The display is off (display blank).
C = 0:
The cursor is off.
B = 0:
The blinking character function is disabled.
6) Function Set instruction bits:
DL = 1: Sets the data bus width for the parallel interface modes to 8-bit (DB7-DB0).
N = 1(0): Number of display lines set to 2 for multiple line displays (number of display lines
set to 1 for single line displays).
BR1,BR0 = 0,0: Sets the luminance level to 100%.
Note that the function set command must be the first instruction sent to the module after any reset.
6.6.1 INITIALIZATION
The modules can be initialized by using instructions if the modules are not reset according to the reset
timing detailed in Section 3.7.1 (Reset Timing). After any reset, the function set command must be the
first instruction sent to the module.
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7.0
CONNECTOR INTERFACE
Pin
NO.
Serial
Paralle
(Intel)
Parallel
(Motorola)
Pin
NO.
Serial
Paralle
(Intel)
Parallel
(Motorola)
1
GND
GND
GND
2
VCC
VCC
VCC
3
SI/SO
NC or RST/
NC or RST/
4
STB
RS
RS
5
NC
WR/
R/W
6
SCK
RD/
E
7
NC
DB0
DB0
8
NC
DB1
DB1
9
NC
DB2
DB2
10
NC
DB3
DB3
11
NC
DB4
DB4
12
NC
DB5
DB5
13
NC
DB6
DB6
14
NC
DB7
DB7
8.0
Soldering Land Function
Some soldering lands are prepared on the tear side of PCB, to set operating mond of the
Display module. A soldering iron is required to short soldering lands.
1. parallel data transfer mode is selected
J6
J7
J2
J3
FUNCTION
Open
Short
*
Open
i80 type
Short
Open
*
Open
M68 type
Open
Open
Pin #3: No connection
Short
Open
Pin #3: /RESET
MPU type Selection
External Reset
Section
2. serial data or parallel data transfer mode set
J5
J3
Open
Open
Short
Short
STANDARD
NAME
J2
FUNCTION
Parallel data Transfer mode
Open
Serial
data Transfer
mode
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