JRC NJU6676CH Datasheet

NJU6676

PRELIMINARY

64-Common X 132-Segment plus 1-Icon

Bit Map Type LCD Controller and Driver

■ GENERAL DESCRIPTION ■ PACKAGE
The NJU6676 is a bit map LCD driver to display

graphics or characters. It c ontains 8,580 bits dis play data
RAM, microprocessor interface circuits, instruction
decoder, 132-segment drivers, 64-common drivers and 1­icon drivers.

The bit image display data is transferred to the display

data RAM by serial or 8-bit parallel interface.

65 x 132 dots graphics or 8-character 4-line by 16 x 16

dots character with icon are displayed by NJU6676 itself.

The wide operating voltage from 2.2 to 5.5V and low
operating current are useful for small size battery
operating items.

The build-in Electrical Variable Resistance is very
precision, furtheremore the rectangle outlook is very
applicable to COG or Slim TCP.

■ FEATURES

NJU6676CH

● Direct Correspondence between Display Data RAM and LCD Pixel

● Display Data RAM - 8,580 bits

● 197 LCD Drivers - 65-common and 132-segment

● Direct Microprocessor Interface for both of 68 and 80 type MPU

● Serial Interface

● Programmable Bias selection ; 1/7,1/9 bias

● Useful Instruction Set
Display Data Read/Write, Display ON/OFF Cont, Static indicator, Display Start Line Set, Bias Select,

Inverse Display, Common Driver order Assignment, Power control set, Page Address Set,
Column Address Set,Status Read, All On/Off, ADC Select, Read Modify Write, Power Saving.

● Power Supply Circuits for LCD Incorporated

Voltage Booster Circuits (4-time Maximum), Regulator, Voltage Follower x 4

● Precision Electrical Variable Resistance (64-step)

● Low Power Consumption 80uA(Typ.).

● Operating Voltage (All the voltages are based on VDD=0V.)

- Rogic Operating Voltage : -2.2V ∼ -5.5V

- Voltage Booster Operating Voltage : -2.5V ∼

- LCD Driving Voltage : -6.0V ∼ -18.0V

● Rectangle outlook for COG

● Package Outline : Bump-chip / TCP

● C-MOS Technology

Ver.1.31

■ PAD LOCATION

DUMMY1

OSC1
OSC2
FRS
FR
CL
DOF
VSS
CS1
CS2
VDD
RES
A0
VSS
WR
RD
VDD
D0
D1
D2
D3
D4
D5
D6(SCL)
D7(SI)
VDD
VDD
VDD
VDD
VSS
VSS
VSS
VSS2
VSS2
VSS2
VSS2
VOUT
VOUT
C3­C3­C1+
C1+
C1­C1­C2­C2­C2+
C2+
VSS
VSS
VDD
VDD
V1
V1
V2
V2
V3
V3
V4
V4
V5
V5
VR
VR
VDD
VDD
VDD
M/S
CLS
VSS
C86
P/S
VDD
VSS
VDD

DUMMY2

COMM

C31

C63

C30

X

Y

C33

NJU6676

PRELIMINARY

C32

DUMMY4
S131
S130

Chip Center : X=0um, Y=0um
Chip Size
:X=8.72mm,Y=2.37mm
Chip Thickness : 675um ± 30um
Bump Size
: 45um x 83um
Pad Pitch : 60um(Min.)
Bump Height : 15um(Typ.)
Bump Material : Au

S1

COMM

C0

NJU6676

PRELIMINARY

n PAD COORDINATES

Chip Size 8.72 x 2.37mm(Chip Center X=0um, Y=0um)

PAD No. Terminal X(um) Y(um) PAD No. Terminal X(um) Y(um)

1 DUMMY1 -4139 -1025 51 VDD 1655 -1025
2 OSC1 -3347 -1025 52 VDD 1715 -1025
3 OSC2 -3287 -1025 53 V1 1775 -1025
4 FRS -3129 -1025 54 V1 1835 -1025
5 FR -2909 -1025 55 V2 1895 -1025
6 CL -2688 -1025 56 V2 1955 -1025
7 DOF -2468 -1025 57 V3 2015 -1025
8 VSS -2311 -1025 58 V3 2075 -1025
9 CS1 -2251 -1025 59 V4 2135 -1025

10 CS2 -2191 -1025 60 V4 2195 -1025

11 VDD -2131 -1025 61 V5 2255 -1025
12 RES -2071 -1025 62 V5 2315 -1025
13 A0 -2011 -1025 63 VR 2375 -1025
14 VSS -1951 -1025 64 VR 2435 -1025
15 WR -1891 -1025 65 VDD 2495 -1025
16 RD -1831 -1025 66 VDD 2555 -1025
17 VDD -1771 -1025 67 VDD 2615 -1025
18 D0 -1613 -1025 68 M/S 2675 -1025
19 D1 -1393 -1025 69 CLS 2810 -1025
20 D2 -1172 -1025 70 VSS 2870 -1025
21 D3 -952 -1025 71 C86 2930 -1025
22 D4 -731 -1025 72 P/S 3065 -1025
23 D5 -511 -1025 73 VDD 3125 -1025
24 D6(SCL) -291 -1025 74 VSS 3185 -1025
25 D7(SI) -70 -1025 75 VDD 3245 -1025
26 VDD 155 -1025 76 DUMMY2 4139 -1025
27 VDD 215 -1025 77 C31 4200 -935
28 VDD 275 -1025 78 C30 4200 -875
29 VDD 335 -1025 79 C29 4200 -815
30 VSS 395 -1025 80 C28 4200 -755
31 VSS 455 -1025 81 C27 4200 -695
32 VSS 515 -1025 82 C26 4200 -635
33 VSS2 575 -1025 83 C25 4200 -575
34 VSS2 635 -1025 84 C24 4200 -515
35 VSS2 695 -1025 85 C23 4200 -455
36 VSS2 755 -1025 86 C22 4200 -395
37 VOUT 815 -1025 87 C21 4200 -335
38 VOUT 875 -1025 88 C20 4200 -275
39 C3- 935 -1025 89 C19 4200 -215
40 C3- 995 -1025 90 C18 4200 -155
41 C1+ 1055 -1025 91 C17 4200 -95
42 C1+ 1115 -1025 92 C16 4200 -35
43 C1- 1175 -1025 93 C15 4200 25
44 C1- 1235 -1025 94 C14 4200 85
45 C2- 1295 -1025 95 C13 4200 145
46 C2- 1355 -1025 96 C12 4200 205
47 C2+ 1415 -1025 97 C11 4200 265
48 C2+ 1475 -1025 98 C10 4200 325
49 VSS 1535 -1025 99 C9 4200 385
50 VSS 1595 -1025 100 C8 4200 445

NJU6676

PRELIMINARY

PAD No. Terminal X(um) Y(um) PAD No. Terminal X(um) Y(um)

101 C7 4200 505 151 S40 1533 1025
102 C6 4200 565 152 S41 1473 1025
103 C5 4200 625 153 S42 1413 1025
104 C4 4200 685 154 S43 1353 1025
105 C3 4200 745 155 S44 1293 1025
106 C2 4200 805 156 S45 1233 1025
107 C1 4200 865 157 S46 1173 1025
108 C0 4200 925 158 S47 1113 1025
109 COMM 4200 985 159 S48 1053 1025
110 DUMMY3 4119 1025 160 S49 993 1025

111 S0 3933 1025 161 S50 933 1025
112 S1 3873 1025 162 S51 873 1025
113 S2 3813 1025 163 S52 813 1025
114 S3 3753 1025 164 S53 753 1025
115 S4 3693 1025 165 S54 693 1025
116 S5 3633 1025 166 S55 633 1025
117 S6 3573 1025 167 S56 573 1025
118 S7 3513 1025 168 S57 513 1025
119 S8 3453 1025 169 S58 453 1025
120 S9 3393 1025 170 S59 393 1025
121 S10 3333 1025 171 S60 333 1025
122 S11 3273 1025 172 S61 273 1025
123 S12 3213 1025 173 S62 213 1025
124 S13 3153 1025 174 S63 153 1025
125 S14 3093 1025 175 S64 93 1025
126 S15 3033 1025 176 S65 33 1025
127 S16 2973 1025 177 S66 -27 1025
128 S17 2913 1025 178 S67 -87 1025
129 S18 2853 1025 179 S68 -147 1025
130 S19 2793 1025 180 S69 -207 1025
131 S20 2733 1025 181 S70 -267 1025
132 S21 2673 1025 182 S71 -327 1025
133 S22 2613 1025 183 S72 -387 1025
134 S23 2553 1025 184 S73 -447 1025
135 S24 2493 1025 185 S74 -507 1025
136 S25 2433 1025 186 S75 -567 1025
137 S26 2373 1025 187 S76 -627 1025
138 S27 2313 1025 188 S77 -687 1025
139 S28 2253 1025 189 S78 -747 1025
140 S29 2193 1025 190 S79 -807 1025
141 S30 2133 1025 191 S80 -867 1025
142 S31 2073 1025 192 S81 -927 1025
143 S32 2013 1025 193 S82 -987 1025
144 S33 1953 1025 194 S83 -1047 1025
145 S34 1893 1025 195 S84 -1107 1025
146 S35 1833 1025 196 S85 -1167 1025
147 S36 1773 1025 197 S86 -1227 1025
148 S37 1713 1025 198 S87 -1287 1025
149 S38 1653 1025 199 S88 -1347 1025
150 S39 1593 1025 200 S89 -1407 1025

NJU6676

PRELIMINARY

PAD No. Terminal X(um) Y(um) PAD No. Terminal X(um) Y(um)

201 S90 -1467 1025 251 C39 -4200 565
202 S91 -1527 1025 252 C40 -4200 505
203 S92 -1587 1025 253 C41 -4200 445
204 S93 -1647 1025 254 C42 -4200 385
205 S94 -1707 1025 255 C43 -4200 325
206 S95 -1767 1025 256 C44 -4200 265
207 S96 -1827 1025 257 C45 -4200 205
208 S97 -1887 1025 258 C46 -4200 145
209 S98 -1947 1025 259 C47 -4200 85
210 S99 -2007 1025 260 C48 -4200 25
211 S100 -2067 1025 261 C49 -4200 -35
212 S101 -2127 1025 262 C50 -4200 -95
213 S102 -2187 1025 263 C51 -4200 -155
214 S103 -2247 1025 264 C52 -4200 -215
215 S104 -2307 1025 265 C53 -4200 -275
216 S105 -2367 1025 266 C54 -4200 -335
217 S106 -2427 1025 267 C55 -4200 -395
218 S107 -2487 1025 268 C56 -4200 -455
219 S108 -2547 1025 269 C57 -4200 -515
220 S109 -2607 1025 270 C58 -4200 -575
221 S110 -2667 1025 271 C59 -4200 -635
222 S111 -2727 1025 272 C60 -4200 -695
223 S112 -2787 1025 273 C61 -4200 -755
224 S113 -2847 1025 274 C62 -4200 -815
225 S114 -2907 1025 275 C63 -4200 -875
226 S115 -2967 1025 276 COMM -4200 -935
227 S116 -3027 1025
228 S117 -3087 1025
229 S118 -3147 1025
230 S119 -3207 1025
231 S120 -3267 1025
232 S121 -3327 1025
233 S122 -3387 1025
234 S123 -3447 1025
235 S124 -3507 1025
236 S125 -3567 1025
237 S126 -3627 1025
238 S127 -3687 1025
239 S128 -3747 1025
240 S129 -3807 1025
241 S130 -3867 1025
242 S131 -3927 1025
243 DUMMY4 -4119 1025
244 C32 -4200 985
245 C33 -4200 925
246 C34 -4200 865
247 C35 -4200 805
248 C36 -4200 745
249 C37 -4200 685
250 C38 -4200 625

■ BLOCK DIAGRAM

Add

NJU6676

PRELIMINARY

Vss

VDD

V1 to V5

VR

Vout
C1+/C1­C2+/C2-

C3-

Vss2

Internal

Power

Circuits

Voltage

Followers

Voltage

Regulator

Voltage

Converter

Common Direction

Page Address Register

C0 - - - - C31 C63 - - - - C32

Drivers

Shift

Register

S0 - - - - - - - - - - - - - S131 COMM

Segment Drivers Common

Display Data Latch

Common

Drivers

Shift

Register

Display Data RAM

65 X 132 = 8,580-bit

Low Address Decoder

Colum Address Recoder

Colum Address Counter

Colum Address Register

Multiplexer

Line Address Decoder

Common

Timing

Line Counter

Display

Timing

Ocsailator

Initial Display Line

M/S
FR
FRS
CL
CLS
DOF

OSC1
OSC2

Instruction

Decoder

Internal Bus Line

Status Busy Flag Bus Holder

Reset MPU Interface

RES CS1 WR RD

CS2 A0 C86 D7

(SI)

D6

(SCL)

P/S

D5 to D0

NJU6676

t

PRELIMINARY

■ TERMINAL DESCRIPTION

Power Supply Peripheral

No. Symbol Description

11,17
26∼29
51,52
65∼67
73,75
8,14,
3031,
32,49
50,70,74
33∼36 VSS2 Reference voltage for voltage booster
53,54
55,56
57,58
59,60
61,62

LCD Driving Power Supply Peripheral

No. Symbol Description

41,42
43,44
47,48
45,46
39,40 C3- Boosted capacitor connecting terminals used for voltage booster.

VDD VDD=+3V

VSS VSS=0V

V1
V2
V3
V4
V5

C1+

C1-

C2+

C2-

LCD Driving Voltage Supplying Terminal. When the internal voltage booster
is not used, supply each level of LCD driving voltage from outside with
following relation.
VDD≥V1≥V2≥V3≥V4≥V5

When the internal power supply is on, the internal circuits generate and
supply following LCD bias voltage from V1 to V4 terminal.
Bias V1 V2 V3 V4
1/7 Bias V5+6/7VLCD V5+5/7VLCD V5+2/7VLCD V5+1/7VLCD
1/9 Bias V5+8/9VLCD V5+7/9VLCD V5+2/9VLCD V5+1/9VLCD
(VLCD=VDD-V5)

Boosted capacitor connecting terminals used for voltage booster.
Boosted capacitor connecting terminals used for voltage booster.

37,38 Vout Voltage booster output terminal. Connect the boosted capacitor between

this terminal and VSS2.

63,64 VR Voltage adjust terminal. V5 level is adjusted by external bleeder resistance

connecting between VDD and V5 terminal.

ＭＰＵ Interface Peripheral

No. Symbol Description

18∼25
(24,25)

13 A0

12 RES Reset terminal. When the RES terminal goes to “L”, the initialization is

9
10

D0∼D7

(SCL,

SI)

CS1
CS2

P/S="H" : Tri-state bi-directional Data I/O terminal in 8-bit parallel operation.
P/S="L" : D7=Serial data input terminal. D6=Serial data clock signal inpu

terminal.Data from SI is loaded at the rising edge of SCL and

latched as the parallel data at 8th rising edge of SCL.
Connect to the Address bus of MPU. The data on the D0 to D7 is
distinguished between Display data and Instruction by status of A0.

A0 H L

Distin

.

performed.
Reset operation is executing during “L” state of RES.
Chip select terminal. Data Input/Output are available during CS1=”L” and
CS2=”H”.

Display Data Instruction

NJU6676

PRELIMINARY

No. Symbol Description

16 RD

(E)

15 WR

(R/W)

71 C86

72 P/S

2
3

69 CLS Terminal to select whether or enable or disable the display clock internal

68 M/S

OSC1
OSC2

<In case of 80 Type MPU> RD signal of 80 type MPU input terminal.
Active "L" During this signal is "L" , D0 to D7 terminals are output.<I n
case of 68 Type MPU> Enable signal of 68 type MPU input terminal.
Active "H"
<In case of 80 Type MPU> Connect to the 80 type MPU WR signal. Actie
"L". The data on the data bus input syncronizing the rise edge of this
signal. <In case of 68 Type MPU>  The read/write control signal of 68
type MPU input terminal.

R/W H L

State Read Write

MPU interface type selection terminal.

C86 H L

State 68 Type 80 Type

Serial or parallel interface selection t erminal.

P/S Chip Select Data/Command Data Read/Write

“H” CS1, CS2 A0 D0∼D7 RD,WR -

“L” CS1, CS2 A0 SI(D7) Write Only SCL(D6)
RAM data and status read operation do not work in mode of
the serial interface. In case of the serial inter face (P/S="L"),RD and WR
must be fixed "H" or "L", and D0 to D5 ar e high impedance.
System clock input terminal for Maker testing.(This terminal should be
Open)For external clock operation, the clock shoud be input to OSC1
terminal.

oscillator circuit.
CLS=”H” : Internal oscillator cir c uit is enabld
CLS=”L” : Internal oscillator cir c uit is disabled (requires external input)
When CLS=”L”, input the display clock through the CL t er m inal.
This terminal selects the master/slave operation for the NJU6676. Master
operation outputs the timing sig nals that are required for the LCD display,
while slave operation inputs the timing signals required for the LCD,
synchronizing the LCD system.
M/S = ”H” : Master operation
M/S = ”L” : Slave operation
The following is true depending on the M/S and CLS stat us:

M/S CLS OSC.

“H” Available Available Output Output Output Output

“H”

“L” Not Avail. Available Input Output Output Output

“L” * Not Avail. Not Avail. Input Input O utput Input

Power Supply

Circuit

Serial
Clock

CL FR FRS DOF

*:Don’t Care

No. Symbol Description

6 CL

5 FR LCD alternating current signal I/O terminal.

7 DOF

4 FRS The output t e r m inal for the static drive.

LCD Drivers

No. Symbol Description

77
∼108

111
∼242

244
∼275

109,
276

(Terminals 1,76,110,243 are Dummy Pad)

C31∼C0 LCD driving signal output terminals.

S0∼S

131

C

32∼C63

COMM COM output terminals for the indicator. Both terminals output the same

Display clock input/output terminal.
The following is true depending on the M/S and CLS stat us.

M/S CLS CL

“H”

“L” * Input

*:Don’t Care
M/S = ”H” : Output

M/S = ”L” : Input
LCD Display blanking control terminal.
M/S = ”H” : Display “On” = “H”, Display “Off” = “L”
M/S = ”L” : External control. Refer to the following table.

Command

Display On” On Off

Display Off” Off Off

This terminal is used in conjunction with the FR term inal.

-Segment output terminals : S0 ∼ S131

-Common output terminal : C0 ∼ C63
Segment output terminal
The following output voltages are selected by the combination of FR and
data in the RAM.

Data

H

L

Common output terminal
The following output voltages are selected by the combination of FR and
status of common.

Scan

Data

H

L

signal.
Leave these open if they are not used.

“H” Output

“L” Input

DOF

H L

FR

H VDD V2

L V5 V3

H V2 VDD

L V3 V5

FR Output Voltage

H V5

L VDD

H V1

L V4

Output Voltage RAM

Normal Reverse

NJU6676

PRELIMINARY

NJU6676

PRELIMINARY

Functional description

(1) Block circuits description
(1-1) Busy Flag (BF)

During internal operation, the LSI is being busy and can’t accept any instructions except “status
read”. The BF data is output through D7 terminal by the “status read ” instruction.
When the cycle time (tcyc) mentioned in the “AC characteristics ” is satisfied , the BF check isn’t
required after each instruction, so that MPU processing performance can be improved.

(1-2) Initial display line register
The initial display line register assigns a DDRAM line address, which corresponds, to COM0 by
“initial display line set” instruction. It is used for not only normal display but also vertical display
scrolling and page switching without changing the contents of the DDRAM.
However, the 65th address for icon display can’t be assigned for initial display line address.

(1-3) Line counter
The line counter provides a DDRAM line address. It initializes its contents at the switching of frame
timing signal (FR), and also counts-up in synchronization with common timing signal.

(1-4) Column address counter
The column address counter is an 8-bit preset counter which provides a DDRAM column address,
and it is independent of below-mentioned page address register.
It will increment (+1) the column address whenever “display data read” or “display data write”
instructions are issued. However, the counter will be locked when no-existing address above (84)H
are addressed. The count-lock will be able to be released by the “column address set” instruction
again. The counter can invert the correspondence between the column address and segment driver
direction by means of “ADC set” instruction.

(1-5) Page address register
The page address register provides a DDRAM page address.
The last page address “8” should be used for icon display because the only D0 is valid.

(1-6) Display data RAM (DDRAM)
The DDRAM contains 8,580 -bit, and stores display data which is 1-to -1 correspondents to LCD
panel pixels.
When normal display mode, the display data “1” turns on and “0” turns off LCD pixels. When inverse
display mode, “1” turns off and “0 ” turns on.

NJU6676

PRELIMINARY

Fig.1 Display data RAM (DDRAM) Map

Page Address Data Display Pattern Line

D0 (00)H COM0
D1 01 COM1
D3,D2,D1,D0 D2 02 COM2

(0,0,0,0) D3 Page 0 03 COM3
D4 04 COM4
D5 05 COM5
D6 06 COM6
D7 07
D0
D1
D3,D2,D1,D0 D2
(0,0,0,1) D3
D4
D5
D6
D7 0F COM15
D0 10 COM16
D1 11 COM17
D3,D2,D1,D0 D2 12 COM18
(0,0,1,0) D3 Page 2 13 COM19
D4 14 COM20
D5 15 COM21
D6 16 COM22
D7 17 COM23
D0 18 COM24
D1 19 COM25
D2 1A COM26
: : : : :
: : : : :
: : : : :
: : : : :

D5 35 COM53
D6 36 COM54
D7 37 COM55
D0 38 COM56
D1 39 COM57
D3,D2,D1,D0 D2 3A COM58
(0,1,1,1) D3 Page 7 3B COM59
D4 3C COM60
D5 3D COM61
D6 3E COM62
D7 3F COM63
(1,0,0,0) D0 Page 8 * COMI

Column ADC “0”

Address “1”

Segment Drivers

Note) COMI is independent of the “Initial display line set” instruction and always corresponds to the 65th line.

n
n
n n
n
n
n
n

00 01 02 03 04 05 06 82 83
83 82 81 80 7F 7E 7D 01 00

0 1 2 3 4 5 6

n

n n

n

08 COM8

n

09 COM9

n

0A COM10

n

Page 1 0B COM11
0C COM12

n

0D COM13

n

0E COM14

Addres

s

130 131

Common

Initial

For example the Initial
display is 08H.

Driver

COM7

NJU6676

PRELIMINARY

(1-7) Common direction register
The common direction register specifies common driver’s scanning direction.

Common drivers Register

A3

0 COM0 ------------------ COM31 COM63 ----------------- COM32
1 COM63 ----------------- COM32 COM0 ------------------ COM31

(1-8) Reset circuit
The reset circuit initializes the LSI to the following status by using of the reset signal into the RES
terminal.

Reset status using the RES terminal:

1. LCD Driver Set off

2. Display off

3. Normal Display (Non-inverse display)

4. ADC select : Normal mode (D0=0)

5. Power control register clear

6. Serial interface register clear

7. LCD bias select : 1/9 bias

8. Read modify write off

9. Static indicator off

10. Initial display line address : (00)H

11. Column address : (00)H

12. Page address : (0) page

13. Common direction register : Normal mode (D3=0)

14. EVR mode off and EVR register : (20)H

15. Test mode off

16. Entire display off : Normal mode
The RES terminal should be connected to MPU’s reset terminal, and the reset operation should be

executed at the same timing of the MPU reset.
As described in the “DC characteristics”, it is necessary to input 10us or over “L” level signal into the
RES terminal in order to carry out the reset operation. The LSI will return to normal operation after
about 1us from the rising edge of the rest signal.
In case of using external power supply for LCD driving voltage, the RES terminal is required to be
being “L” level when the external power supply is turned-on.
The “Reset” instruction in Table.4 can’t be substituted for the reset operation by using of the RES
terminal. It executes above-mentioned only 8 to 16 items.

(1-9) LCD display circuits
a) Common and segment drivers

LCD drivers consist of 64-common drivers, 132-segment divers and 1-icon-common driver.
As shown in Fig.7, LCD driving waveforms are generated by the combination of display data,
common timing signal and internal FR timing signal.

PAD No.
Pin name

C0 ------------------------------ C31 C63 ---------------------------- C32

NJU6676

PRELIMINARY

b) Display data latch circuit
The display data latch circuit temporally stores 132-bit display data transferred from the DDRAM in
the synchronization with the common timing signal, and then it transfers these stored data to the
segment drivers.
“Display on/off”, “inverse display on/off” and “entire display on/off” instructions control only the
contents of this latch circuit, they can’t change the contents of the DDRAM.
In addition, the LCD display isn’t affected by the DDRAM accuses during its displaying because the
data read-out timing from this latch circuit to the segment drivers is independent of accessing timing
to the DDRAM.

c) Line counter and latch signal or latch Circuits
The clock line counter and latch signal to the latch circuits are generated from the internal display
clock (CL). The line address of display data RAM is renewed synchronizing with display clock (CL).
132 bits display data are latched in display latch circuits synchronizing with display clock, and then
output to the LCD driving circuits. The display data transfer to the LCD driving circuits is executed
independently with RAM access by the MPU.

d) Display timing generator
The display timing generates the timing signal for the display system bay combination of the master
clock CL and driving signal FR ( refer to Fig.2 ) The frame signal FR and LCD alternative signal
generate LCD driving waveform on the two frame alternative driving method.

e) Common timing generation
The common timing is generated by display clock CL (refer to Fig.2)

Fig.2 Display Timing

CL

FR

COM0

COM1

RAM data

SEG n

64 63 1 2 3 4 5 6 7 8 64 63 1 2 3 4 5 6 7 8

Fig.2 Waveform of Display Timing

NJU6676

PRELIMINARY

f) Oscillator
This is the low power consumption CR oscillator which provides the display clock and voltage
converter-timing clock .

e) Internal power circuits
The internal power circuits are composed of x4 boost voltage converter, output voltage regulator
including 64-step EVR and voltage followers.
The optimum values of the external passive components for the internal power circuits, such as
capacitors for V1 to V5 terminals and feed back resistors for VR terminal, depend on LCD panel size.
Therefore, it is necessary to evaluate the actual LCD module with these external components in
order to determine the optimum values.
Each portion of the internal power circuits is controlled by “power control set” instruction as shown in
Table.1. In addition , the combination of power supply circuits is described in Table.2.

Table.1) Power control set

Bits Portions Status
D2 Voltage converter 1 :On 0: Off

D1 Voltage regulator 1 :On 0: Off
D0 Voltage followers 1 :On 0: Off

Table.2) Power supply combinations

Status D2 D1 D0 Voltage

converter

Using all internal power circuits 1 1 1 On On On Vss2 Use
Using voltage regulator and
Voltage followers
Using voltage followers 0 0 1 Off Off On V5, Vss2 Open
Using only external power supply 0 0 0 Off Off Off V1 to V5 Open

0 1 1 Off On On Vout,

Note1) Capacitor input terminals: C1+, C1 -, C2+, C2-, C3­Note2) Do not use other combinations except examples in Table.2.
Note3) Connect decoupling capacitors on V1 to V5 terminals w henever using the voltage followers.

Voltage

regulator

Voltage

followers

External

voltage

Vss2

Capacito

r

terminals

Open