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CHAPTER 5 PERIPHERAL HARDWARE FUNCTION
5.6.6 Operation in 2-wire serial I/O mode
The 2-wire serial I/O mode can be used in any communication format if so specified by program.
Basically, communication is established by using two lines: serial clock (SCK) and serial data input/output (SB0
or SB1).
Figure 5-67. Example of System Configuration in 2-wire Serial I/O Mode
2-wire serial I/O
2-wire serial I/O
SCK
SCK
V
DD
SB0, SB1
SB0, SB1
Master CPU
( PD753108)
Slave CPU
Remark
The
μ
PD753108 can be also used as a slave CPU.
(1) Register setting
When the 2-wire serial I/O mode is used, the following two registers must be set:
Serial operation mode register (CSIM)
Serial bus interface control register (SBIC)