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CHAPTER 14 8-BIT SERIAL I/O
14.6 Operations of Serial Output Functions
In the 8-bit serial I/O, 8-bit serial output operation synchronized with a shift clock is
possible.
■ Serial Output Operation
Serial output operation is divided into serial output operation using an internal shift clock and serial output
operation by using the external shift clock. When serial I/O operation is allowed, serial data is input in the
SDR and, at the same time, the contents of the SDR are output to the serial data output pin (SO).
● Serial output operation via internal shift clock
Serial output operation using the internal shift clock requires the settings shown in Figure 14.6-1 .
Figure 14.6-1 Settings Required for Serial Output Operation using Internal Shift Clock
When serial output operation is started, the contents of the SDR are output to the SO pin in synchronization
with the falling edge of the selected internal shift clock. In this case, the transfer destination (serial input
side) must be in the external shift clock input wait state.
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
SMR SIOF SIOE SCKE SOE CKS1 CKS0 BDS SST
1
SDR
SSEL SSEL
1
1
1
1
Other than 11
Transmission data setting
: Used bit
: Set "1"