UPD784218 Datasheet, PDF (39/92 Pages) NEC – 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784218, 784218Y
8.7 Serial Interfaces
Three independent serial interface channels are provided.
• Asynchronous serial interface (UART)/3-wire serial I/O (IOE) × 2
• Clocked serial interface (CSI) × 1
• _{3-wire serial I/O (IOE)}
• _I²_{C bus interface (I}²_{C) (µPD784218Y Subseries only)}
Therefore, communication with an external system and local communication within the system can be simultaneously
executed (refer to Figure 8-9).
Figure 8-9. Example of Serial Interface
(a) UART + I²C
µPD784218Y (master)
VDD VDD
µ PD4711A
µPD780078Y (slave)
[UART]
RxD1
[I²C]
SDA0
SDA
RS-232C
TxD1
SCL0
SCL
driver/receiver
Port
µPD780308Y (slave)
µ PD4711A
[UART]
RS-232C
driver/receiver
RxD2
TxD2
Port
SDA
SCL
LCD
(b) UART + 3-wire serial I/O
µPD784218 (master)
µ PD4711A
[UART]
RxD2
RS-232C
driver/receiver
TxD2
Port
SO1
SI1
SCK1
INTPm
Port
[3-wire serial I/O]
Note
µ PD753106 (slave)
SI
SO
SCK
Port
INT
Note Handshake line
Data Sheet U12304EJ2V0DS00
39