Table of Contents
Advertisement
(iii) Transfer start
A serial transfer starts when the following two conditions have been satisfied and transfer data has been set
to serial I/O shift register n (SIOn).
• The SIOn operation control bit (CSIEn) = 1
• After an 8-bit serial transfer, the internal serial clock is either stopped or is set to high level.
• Transmit/receive mode
When CSIEn = 1 and MODEn = 0, transfer starts when writing to SIOn.
• Receive-only mode
When CSIEn = 1 and MODEn = 1, transfer starts when reading from SIOn.
Caution After data has been written to SIOn, transfer will not start even if the CSIEn bit value is
set to "1".
Completion of an 8-bit transfer automatically stops the serial transfer operation and sets the interrupt request
flag (INTCSIn).
216
CHAPTER 10
SERIAL INTERFACE FUNCTION
Advertisement
Table of Contents
