Panasonic KX-FT21BX Service Manual page 141

162
STB4
163
THDAT
164
VSS
165
MULT3/5
166
THCLK
167
THLAT
168
STBNP
169
3.3V
170
TXD2/IOP
171
RXD2/IOP
172
RTS2/IOP
173
CTS2/IOP
174
DSR2/IOP
175
DCD2/IOP
176
DTR2/IOP
177
RI2/IOP
178
XRSTSWI/IP83
179
KEYIN0
180
KEYIN1
181
KEYIN2
182
KEYIN3
183
KEYIN4
184
KEYIN5
185
OPLED
186
VSS
187
3.3V
188
KSTART
189
KLATCH
190
KSCLK
191
KTXD
192
KRXD
193
ADSEL1
194
VSSC
195
VREFB
196
VREFT
197
BIAS
198
VREFH
199
VDDC
200
VSSA
201
VDDA
202
VDDB
203
VCL
204
AIN3
205
AIN1
206
AMON
207
AIN2
208
VSSB
2.ROM (IC2)
This 128 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK15).
The capacity of each bank is 8 KB.
The addresses of the common area are from 0000H to 7FFFH, and addresses 8000H to 9FFFH are for the bank
area.
3. RAM (IC3)
This 32 KB RAM has 8 KB of common area and bank area (BK0, BK1).
The capacity of each bank is 12 KB.
The addresses of the common area are from D000H to EFFFH, and addresses A000H to CFFFH are for the
bank area.
NO
MULT3/5
NO
MULT3/5
-
NO
MULT3/5
NO
MULT3/5
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES PULL DOWN
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
-
Analog
-
Analog
-
Analog
-
Analog
-
Analog
-
Analog
-
Analog
-
Analog
-
Analog
OPEN O Not used
TH DATA O Thermal data
DG
Ground
+5V
Pow er supply for THCLK, DAT, LAT, STB
TH CLK O Thermal head clock
TH LAT O Thermal head latch
CIS SEL
+3.3V
Pow er supply
TH ON O Thermal head 24V ON
RS I/O LCD control
OPEN O Not used
CIS ON O Not used
MOTOR PO. I
Motor position detection
OPEN O Not used
OPEN O Not used
OPEN O Not used
Pull dow n
KIN0 I/O Key read
KIN1 I/O Key read
KIN2 I/O Key read, document sensor control
KIN3 I/O Key read, read start position sensor control
OPEN O Not used
OPEN O Not used
OPESEL OD Operation panel control
DG
GND
OD Pow er supply
3.3V
OD LCD control
KSTART
OD Key scan, LCD control
KLATCH
OD Key scan, LCD control
KSCLK
I
KTXD Key scan, LCD control
O Document, read start position sensor
KRXD
ADSEL1 Thermal head temperature detection trigger
DG
Ground for analog image process
VREFB A/D reference-
VREFT A/D reference+
BIAS
VREFH A/D reference center
+3.3V
Pow er supply for analog image process
DG
Ground for analog image process
+3.3V
Pow er supply for analog image process
+3.3V
Pow er supply for analog image process
VCL
Clamp level
AIN3
AIN1 Analog image signal (CIS output signal input)
OPEN Not used
AIN2 Thermistor voltage detection
DG
Ground for analog image process
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KX-FT21LA