UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 481
UPD784026
Manufacturer Part Number
UPD784026
Description
16/8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD784026.pdf
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17.4 3-WIRE SERIAL I/O MODE
input (SI). Handshaking lines are required when a number of devices are connected.
The 3-wire serial I/O mode is used to communicate with devices that incorporate a conventional clocked serial interface.
Basically, communication is performed using three lines: the serial clock (SCK), serial data output (SO), and serial data
* Handshaking lines
3-wire serial I/O
Figure 17-5 Example of 3-Wire Serial I/O System Configuration
3-wire serial I/O
Master CPU
Port (Interrupt)
CHAPTER 17 CLOCKED SERIAL INTERFACE
SCK
Port
SO
SI
*
SCK
SI
SO
Port
Interrupt (Port)
Slave CPU
441
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