R-875/885 -
25
Pin No.
Signal
I/O
Description
26
P40
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51-P53 terminal
while one of J-5 line tact switches on matrix is touched.
27
P77
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P50-P53 terminal
while one of J-2 line tact switches on matrix is touched.
28
P76
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P50-P53 terminal
while one of J-1 line tact switches on matrix is touched.
29-32
P75-P72
OUT
Terminal not used.
33
P71
IN
Signal coming from encoder.
Signal similar to INT1. Pulse signals are input into P24.
34
INT0
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signal is input into INT1.
35
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
Temporarily set to “L” level the moment power is applied, at this time the LSI is
reset. Thereafter set at “H” level.
36
XCIN
IN
Connected to VC.
37
XCOUT
OUT
Terminal not used.
38
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
39
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
40
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
41
P27
OUT
Bottom heating element driving signal.
To turn on and off the relay (RY4). “L” level during grill
cooking, convection cooking or dual cooking, “H”
level otherwise. The heater relay turns on and off
within a 54 second time base in accordance with the
special program in LSI.
42
P26
OUT
Convection motor driving signal.
To turn on and off shut-off relay (RY7). “L” level during
convection cooking or dual cooking, “H” level otherwise.
(Relay RY7 does not turn on at preheating mode.)
43
P25
OUT
Fan motor driving signal.
To turn on and off the fan motor relay (RY6).
“L” level during cooking, or for a while after
convection or dual cooking. “H” level otherwise.
44
P24
OUT
Terminal not used.
45
P23
OUT
Touch control transformer driving signal.
To turn on and off the shut off relay (RY5). If the oven has not been used for more
than 3 minutes, the relay RY5 will be turned off. The relay RY5 will be turned on
when the oven door is opened and closed.
46
P22
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY2). In 100% operation, the
signals hold “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.
ON
OFF
During
cooking
L
GND
H.
(Grill, Convection, Dual )
ON
OFF
During
cooking
L
GND
H.
( Convection or Dual cooking )
ON
OFF
During cooking, or for a while
after convection or dual cooking.
L
GND
H.
DESCRIPTION OF LSI
The I/O signal of the LSI are detailed in the following table
MICRO
ON
OFF
COOK
100%
54 sec.
0 sec.
70%
40 sec.
14 sec.
50%
29 sec.
25 sec.
30%
18 sec.
36 sec.
10%
9 sec.
45 sec.
MICRO
ON
OFF
COOK
100%
32 sec.
0 sec.
70%
24 sec.
8 sec.
50%
18 sec.
14 sec.
30%
12 sec.
20 sec.
10%
6 sec.
26 sec.
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
ON/OFF time ratio in Micro
cooking
(a. 54second time base)
