20
R - 2 0 4 E W A
Pin No.
Signal
I/O
Description
23
P23
IN
Signal similar to K02.
When either G7 line on key matrix is touched, a corresponding signal will be input into P23.
24
K00
IN
Signal similar to K02.
When either G8 line on key matrix is touched, a corresponding signal will be input into K00.
25
K01
IN
Signal similar to K02.
When either G9 line on key matrix is touched, a corresponding signal will be input into K01.
26
K02
IN
Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of R00, R01,
R02, R03, P20 and P21 will be input into K02. When no key is touched, the signal is
held at “H” level.
27
K03
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of
LSI.
28
COM0
OUT
Common data signal: COM1.
Connected to LCD (Pin No. C1)
29
COM1
OUT
Common data signal: COM2.
Connected to LCD (Pin No. C2)
30
COM2
OUT
Common data signal: COM1.
Connected to LCD (Pin No. C3)
31
COM3
OUT
Terminal not used.
32-33
SEG0-SEG1
OUT
Terminal not used.
34
SEG2
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds “L” level during microwave cook-
ing and “H” level while not cooking. In other
cooking modes (variable cooking) the signal
turns to “H” level and “L” level in repetition
according to the power level.
35
SEG3
OUT
Terminal not used.
36
SEG4
OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
37-39
SEG5-SEG7
OUT
Terminal not used.
40-51
SEG8-SEG19
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD segment
LSI signal (Pin No.)
LCD segment
SEG 8 (40) .......................... S12
SEG 14 (46) ........................... S6
SEG 9 (41) .......................... S11
SEG 15 (47) ........................... S5
SEG 10 (42) .......................... S10
SEG 16 (48) ........................... S4
SEG 11 (43) ............................ S9
SEG 17 (49) ........................... S3
SEG 12 (44) ............................ S8
SEG 18 (50) ........................... S2
SEG 13 (45) ............................ S7
SEG 19 (51) ........................... S1
52-53
VC1-VC2
IN
Power source voltage input terminal.
Standard voltage for LCD.
54
VC3
OUT
Terminal not used.
GND
-5V
16.7 msec.
H : GND
L : -5V
OFF
ON
ON
OFF
OFF
H : GND
L : -5V
100P
70P
24 sec.
8 sec.
During cooking
L : -5V
H : GND
16.7 msec.
