UPD784938 Datasheet, PDF (425/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 17 OUTLINE OF SERIAL INTERFACE
The µPD784938 Subseries is provided with four independent serial interface channels. Therefore, communication with
an external system and local communication within the system can be simultaneously executed by using these four
channels.
• Asynchronous serial interface (UART)/3-wire serial I/O (IOE) × 2 channels
→ Refer to CHAPTER 18.
• Clocked serial interface (CSI) × 2 channels
• 3-wire serial I/O mode (MSB/LSB first)
→ Refer to CHAPTER 19.
Figure 17-1 shows an example of the serial interface.
Figure 17-1. Example of Serial Interface
UART + 3-wire serial I/O + 2-wire serial I/O
µ PD784938 (master)
µ PD4711A
[3-wire serial I/O]
SO1
[UART]
RxD
RS-232-C
TxD
driver/
SI1
SCK1
INTPm
Note
receiver
Port
Port
Slave
SI
SO
SCK
Port
INT
VDD VDD
Slave
SI0
SB0
SO0
SCK0
INTPn
Note
SCK0
Port
Port
INT
[2-wire serial I/O]
Note Handshake line
Preliminary User’s Manual U13987EJ1V0UM00
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