UPD6604 Datasheet, PDF (54/64 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

13. APPLIED CIRCUIT EXAMPLE
Example of Application to System
· Remote-control transmitter (40 keys; mode selection switch accommodated)
µPD6604
KI/O6
KI/O5
KI/O7
KI/O4
S0
KI/O3
+
S1/LED
KI/O2
REM
KI/O1
VDD
KI/O0
+
OSCOUT
KI3
R
OSCIN
KI2
C
GND
KI1
RESET
KI0
µ PD6604GS
· Remote-control transmitter (48 keys accommodated)
Mode selection switch
Key matrix
8 × 5 = 40 keys
KI/O6
KI/O5
KI/O7
KI/O4
S0
KI/O3
+
S1/LED
KI/O2
REM
KI/O1
VDD
KI/O0
+
OSCOUT
KI3
R
OSCIN
KI2
C
GND
KI1
RESET
KI0
µPD6604GS
Key matrix
8 × 6 = 48 keys
Remark When the POC circuit of the mask option is used effectively, it is not necessary to connect the capacitor
enclosed in the dotted lines.
54
Data Sheet U11281EJ3V0DS00