R-61FBSTM - Sharp Home Appliance Service Manual (repair manual). Page 16

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R-61FBSTM/R-62FBSTM - 16
DESCRIPTION OF LSI
LSI(IXA216DRZZ)
The I/O signal 
of the LS
I(IXA216DRZZ) are detailed in the following table.
Pin No.
Signal
I/O
Description
1
P50
IN
Signal coming from tact switch.
When tact switch SW4 is touched, a signal out of P24 will be input into P50. When no tact
switch is touched, the signal is held at “H” level.
2
P51
IN
Signal coming from tact switch.
When either tact switches SW1, SW2 and SW3 is touched, a corresponding signal out of
P22, P23 and P24 will be input into P51. When no tact switch is touched, the signal is held
at “H” level.
3
P52
IN
Terminal not used.
4
P53
OUT
Terminal not used.
5
VPP
_
Connected to VSS through the resistor.
6
XT1
IN
Connected to VSS.
7
XT2
_
Terminal not used.
8
VDD
IN
Power source voltage input terminal.
The power souce voltage to drive the LSI. Connected to GND.
9
VSS
IN
Power source voltage input terminal.
The power souce voltage to drive the LSI.
10
X1
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to X2 terminal.
11
X2
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of X1.
12
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
13-15
P00-P02
OUT
Terminal not used.
16
P03
OUT
Back light circuit (Light emitting diodes) driving signal.
17
CAPH
_
Terminal not used.
18
CAPL
_
Terminal not used.
19-21
VLC0-VLC2
IN
Power source voltage input terminal.
Standard voltage for LCD.
22
COM0
OUT
Common data signal.
Connected to LCD signal C1.
23
COM1
OUT
Common data signal.
Connected to LCD signal C2.
24
COM2
OUT
Common data signal.
Connected to LCD signal C3.
25
COM3
OUT
Terminal not used.
26-37
SEG0-SEG11
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (segment)
LSI signal (Pin No.)
LCD (segment)
SEG 0 (26) ................................. S1
SSEG 6 (32) ...................................... S7
SEG 1 (27) ................................. S2
SEG   7 (33) ....................................... S8
SEG 2 (28) ................................. S3
SEG   8 (34) ....................................... S9
SEG 3 (29) ................................. S4
SEG   9 (35) ..................................... S10
SEG 4 (30) ................................. S5
SEG 10 (36) ..................................... S11
SEG 5 (31) ................................. S6
SEG 11 (37) ..................................... S12
38-40
SEG12-SEG14
OUT
Terminal not used.
41
P70
OUT
Oven lamp 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.
20 msec.
During cooking
H : GND
L : -5V
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