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Serial Interface
13-32
SBO
SBI
SBT
Transmission
SBO
SBI
SBT
Reception
SBO
SBI
SBT
Transmission/
reception
SBO
SBI
SBT
Transmission/
reception
Unidirectional transfer Bi-directional transfer (SCnMD0 = “0”)
n = 1 or 2
SBO
SBI
SBO
SBI
Bi-directional transfer (SCnMD0 = “1”)
n = 1 or 2
SBT SBT
Transmission/
reception
Transmission/
reception
13.3.4 Description of Operation
■ Clock synchronous serial interface n connection (n=1,2)
Two different connection methods are possible, one for unidirectional transfer, and the other for bi-directional
transfer.
When SBT pin is an output only during transmission (SCnTOE = "0"), it is necessary to pull up SBT pin. In
addition, when using SBO pin as a data input/output (SCnMD0 = "1"), it is necessary to pull up SBO pin. Connect
a pull-up resistor externally.
When using SBO pin as a data output and SBI pin as a data input (SCnMD0 = "0"), the SBO pin is always an output
and the SBI pin is always an input.
When using SBO pin as a data input/output (SCnMD0 = "1"), the SBO pin is an output only during transmission,
and is normally an input.
When SCnTOE is "0", the SBT pin is an output only during transmission with the internal clock, and is normally an
input. Furthermore, when SCnTOE is "1", the SBT pin is always an output when the internal clock is selected.
Fig. 13-3-2 Connections