Sharp R-895(AL)M Service Manual page 26

The I/O signal of the LSI are detailed in the following table.
Pin No. Signal
26 P40
27 P77
28 P76
29 P75
30 P74
31 P73
32 P72
33 P71
34 P70
35 RESET
36 XCIN
37 XCOUT
38 XIN
39 XOUT
40 VSS
41 P27
42 P26
43 P25
44 P24
45 P23
DESCRIPTION OF LSI
I/O
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G7 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G6 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G5 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G4 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G3 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G2 line key on matrix is touched.
OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P50-P53 terminal
while one of G1 line key on matrix is touched.
IN/OUT Terminal not used.
IN Connected to VC.
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 "Hµ...level.
IN Connected to VC.
OUT Terminal not used.
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.
OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
IN Power source voltage: -5V.
VC voltage of power source circuit input.
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.
OUT Convection motor driving signal.
To turn on and off shut-off relay (RY7). "L" level
during convection or dual cooking, "H" level otherwise.
(Relay RY7 does not turn on at preheating mode.)
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.
OUT Terminal not used.
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 2 minutes, the relay RY5 will be turned off. The relay RY5 will be turned on
when the oven door is opened and closed.
Description
R-895M - 21
During
OFF
cooking
(Grill, Convection, Dual )
ON
H.
During
OFF
cooking
( Convection or Dual cooking )
ON
L
H. GND
OFF
ON
L
During cooking, or for a while
after convection or dual cooking.
H. GND
L
GND