20
R-25AM
20-21
P46-P45
-
Terminal not used.
22
P44
OUT
Oven lamp, Blower motor and Antenna motor driving signal (Square Waveform
: 50Hz).
To turn on and off the shut-off relay (RY1).
The Square waveform voltage is delivered
to the RY1 relay driving circuit and relays
(RY3, RY4, COOK RELAY) control circuit.
23
P43
-
Terminal not used.
24
P42
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
25
INT1
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
26
INT0
IN
Signal coming from encoder.
Signal similar to P42. Pulse signals are input into INT0.
27
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.
28
P71
OUT
Memory (EEPROM) clock output.
29
P70
IN/OUT
Memory (EEPROM) data input/output.
30
XIN
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
32
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
33
P27
-
Terminal not used.
34
P26
IN
Signal coming from switch unit.
When either one of G-1 line switches on switch matrix is touched, a corresponding
signal out of P30 - P31 will be input into P26. When no switch is touched, the signal
is held at "L" level.
35
P25
IN
Signal similar to P26.
When either one of G-2 line switches on switch matrix is touched, a corresponding
signal will be input into P25.
36
P24
IN
Signal similar to P26.
When either one of G-3 lineswitches on switch matrix is touched, a corresponding
signal will be input into P24.
37-40
P23-P20
OUT
Segment data signal.
The relation between signals and indicators are as follows:
Signal
Segment
Signal
Segment
Signal
Segment
P01 ..................... k
P21 ......................... h
P15 ..................... d
P02 ...................... j
P20 ......................... g
P14 ...................... c
P03 ...................... i
P17 ......................... f
P13 ..................... b
P23 .................. LB
P16 ......................... e
P12 ..................... a
P22 .................. UB
Pin No.
Signal
I/O
Description
H
L
20 msec
During cooking
GND
-31(V)
ß(50Hz)
GND
-5V
20 msec.
OFF
ON
