R-209(IN)
R-209(W)
R-209(Y)
16
DESCRIPTION OF LSI
The I/O signal of the LSI are detailed in the following table.
Pin No.
Signal
I/O
Description
1
VDD
IN
Power source voltage: 5V.
Connected to 5V.
2
VSS
IN
Power source voltage: 0V.
Connected to 0V.
3
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is generated by connecting the capacitor and resistor
to XIN.
4
XOUT
OUT
Terminal not used.
5
CNVSS
IN
Connected to VSS through resistor.
6
RESET
IN
Auto clear terminal.
Signal is inputted to reset the LSI to the initial state when power is supplied.
7
AIN1
IN
Signal coming from potentiometer.
Voltage from potentiometer is converted into the power level by the A/D converter
built into the LSI.
8
AIN0
IN
Cooking start detection terminal.
When “H” level is inputted to AIN0, cooking starts.
9
D3
OUT
Signal to allow Magnetron high-voltage circuit to be drived.
While the signal (Sqrare Waveform) is
generating from D3, the Magnetron high-
voltage circuit is allowed to be drived.
10
D2
OUT
Signal to check the model.
11
D1
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY1). The
signal holds “L” level during microwave
cooking and “H” level while not cooking. In
other cooking modes (70%, 50%, 30%, 10%)
the signal turns to “H” level and “L” level in
repetition according to the power level.
12
D0
OUT
Terminal not used.
13
INT
IN
Signal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time processing of LSI.
14-16
P12-P10
OUT
Terminal not used.
17-20
P03-P00
IN
Terminal to change the Models and functions.
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
20 msec
During cooking
H
L
20 msec
H : 5V
L : 0V
