19
R-204EWA
DESCRIPTION OF LSI
The I/O signal of the LSI are detailed in the following table.
Pin No.
Signal
I/O
Description
1
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.
2
TEST
IN
Connected to GND.
3
VSS
IN
Power source voltage: -5V.
VSS voltage of power source circuit input. Connected to VC.
4
OCS3
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the resistor oscillation circuit with
respect to OCS4 terminal.
5
OCS4
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of OCS3.
6
VD1
IN
Power source for oscillation circuit.
7
VDD
IN
Power source voltage input terminal.
Connected to GND.
8
AVDD
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
9
AVREF
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
10
AVSS
IN
Power source voltage: -5V.
AVSS voltage of power source circuit input. Connected to VC.
11-13
P40-P42
IN
Terminal to change functions according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the
Model in operation is applied to set up its function.
14
P43
IN
To input signal which communicates the door open/close information to LSI.
Door close “H” level signal (0V). Door open “L” level (-5V).
15
BZ
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
16
R00
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G6 line keys on key matrix is touched.
17
R01
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G5 line keys on key matrix is touched.
18
R02
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G4 line keys on key matrix is touched.
19
R03
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G3 line keys on key matrix is touched.
20
P20
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G2 line keys on key matrix is touched.
21
P21
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G1 line keys on key matrix is touched.
22
P22
OUT
Terminal not used.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
