CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
309
Figure 10-9. Timing of 3-Wire Serial I/O Mode (Transmission/Reception)
1
2
3
4
5
6
7
8
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
SCKn
SIn
SOn
Serial transmission/reception complete
interrupt generation
Transfer start in synchronization with falling of SCKn
Execution of write instruction to SIOn register
INTCSIn interrupt
Remark
n = 0 to 3
10.3.8 Example of system configuration
Using 3 signal lines, the serial clock (SCKn), serial input (SIn) and serial output (SOn), transfer of 8-bit data is
carried out. This is effective in cases where connections are made to peripheral I/O with the old type of clocked serial
interface built in, or with a display controller, etc. (n = 0 to 3).
If connecting to multiple devices, a line for handshake is necessary.
Since either the MSB or the LSB can be selected as the communication’s header bit, it is possible to communicate
with various types of device.
Figure 10-10. Example of CSI System Configuration
Master CPU
Slave CPU
Handshake line
SCK
SO
SI
Port (interrupt)
Port
SCK
SI
SO
Port
Interrupt (port)
(3-wire serial I/O 3-wire serial I/O)
Summary of Contents for V850E/MS1 UPD703100
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