19
R-1200
R-1201
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
Description
1-2
VL2-VL1
IN
Power source voltage input terminal.
Standard voltage for LCD.
3-6
AN7-AN4
IN
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
7
AN3
OUT
Back light circuit (Light emitting diodes) driving signal.
8
AN2
IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
9-10
AN1-AN0
OUT
Terminal not used.
11-13
P57-P55
OUT
Terminal not used.
14
CNTR0
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
15
P53
OUT
Terminal not used.
16
P52
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.
17-18
P51-P50
OUT
Terminal not used.
19
P47
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.
20
P46
IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will
be input into P46. When no key is touched, the signal is held at "H" level.
21
P45
IN
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into P45.
22
P44
IN
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P44.
23
P43
IN
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
24
INT0
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
25
P41
OUT
Terminal not used.
26
P40
IN
Connected to GND through the pull-down resistor R100.
27
RESET
IN
Auto clear terminal.
Signal is inputted to reset the LSI to the initial state when power is applied.
28-29
P71-P70
OUT
Terminal not used.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
During cooking
H : GND
L : -5V
Maximum
out put
70% of maximum
out put
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF
OFF
24 sec.
8 sec.
16.7 msec.
H : GND
L : -5V
