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Pin No.
Signal
I/O
47
P05
OUT
48-52
P04-P00
OUT
53
P57
OUT
54
P56
IN
55
TXD1
IN
56
RXD1
IN
57
P53
IN
58
P52
OUT
59
P51
IN
60
INT0
IN
61
AVSS
IN
62
VREF
IN
63
AN7
IN
64
AN6
IN
Drawer Microwave
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). In 100%
power operation, the signals holds "H" level during
microwave cooking and "L" level while not cooking.
In other cooking modes (90%, 80%, 70%, 60%,
50%, 40%, 30%, 20%, 10%, 0%) the signal turns
to "H" level and "L" level in repetition according to
the power level.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Common relay driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relays (RY1). The
square waveform voltage is delivered to the relay
(RY1) driving circuit.
Terminal not used.
Terminal not used.
Terminal not used.
Terminal not used.
Signal to sound buzzer.
A: Key touch sound.
B: Completion sound.
C: When the oven stops so that the food can be
checked in Automatic cooking mode.
Input signal which communicates the drawer door close information to LSI.
Door opened; "H" level signal(+5V).
Door closed; "L" level signal(0V).
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to +5V.
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D converter
built into the LSI.
3-13
Theory of Operation
Description
VARI MODE
100% power
90% power
80% power
70% power
60% power
50% power
40% power
30% power
20% power
10% power
0% power 0 sec.
A
B
1.0 sec
C
Microwave cooking mode
Other cooking mode
ON TIME OFF TIME ON TIME OFF TIME
32 sec.
0 sec.
60sec.
0ec.
30 sec.
2 sec.
54sec.
6sec.
26 sec.
6 sec.
48sec.
12sec.
24 sec.
8 sec.
42sec.
18sec.
22 sec.
10 sec.
36sec.
24sec.
18 sec.
14 sec.
30sec.
30sec.
16 sec.
16 sec.
24sec.
36sec.
12 sec.
20 sec.
18sec.
42sec.
8 sec.
24 sec.
12sec.
48sec.
6 sec.
26 sec.
4sec.
56sec.
32 sec.
0sec.
60sec.
16.7 msec.
H: +5V
L: GND
During cooking
0.1 sec
2.0 sec
1.0 sec
H: +5V
L: GND
H : +5V
L : GND
16.7 msec.
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