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•
When edge = "1"
When the edge bit is set to "1", the data are output from SO on the falling edge of the SCK
clock. The SI input is also input to the shift register on the falling edge of the SCK clock.
(3)
8/
4
bit
The
8/
4
bit
selects the length of the serial data. Setting this bit to "0" selects 4 bit data; setting
the bit to "1" selects 8 bit data. When the internal clock is selected, setting 4 bit data outputs four
SCK clock cycles, while setting 8 bit data outputs eight SCK clock cycles.
•
When
8/
4
bit
•
When
8/
4
bit
(4)
SO
-
I/
O
bit
The
SO
-
I/
O
bit sets the SO pin to either serial input or serial output.
Setting the
SO
-
serial data input. By using this bit to control the pin operation, the input and output of data with
LSIs supporting a serial bus, such as T-BUS, can be easily controlled with a single pin.
Note 45: In this case, as there is a period when the pin is floating, the SO pin must be pulled-up.
= "0" (with edge = "0" and
(with edge = "0" and
SCK
I/
O
bit to "0" sets the SO pin to serial data output. Setting "1" sets the pin to
41
SCK
-
INV
= "0")
= "0")
-
INV
TC9314F
2003-07-03
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