UPD784031 Datasheet, PDF (36/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
8.8 Serial Interface
Three independent serial interface channels are incorporated.
• Asynchronous serial interface (UART)/three-wire serial I/O (IOE) × 2
• Synchronous serial interface (CSI) × 1
• Three-wire serial I/O (IOE)
• Two-wire serial I/O (IOE)
So, communication with points external to the system and local communication within the system can be performed
at the same time. (See Figure 8-9.)
Figure 8-9. Example Serial Interfaces
UART + Three-wire serial I/O + Two-wire serial I/O
µ PD784031 (master)
µPD75108 (slave)
µPD4711A
[Three-wire serial I/O]
SO1
SI
(UART)
RxD
RS-232-C
driver/receiver
TxD
Port
SI1
SCK1
Note
INTPm
Port
SO
SCK
Port
INT
VDD VDD
µPD78014 (slave)
SDA
SB0
SCL
INTPn
Note
SCK0
Port
Port
INT
[Two-wire serial I/O]
Note Handshake line
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