TMPM330 - Keil

SCK pin
SIOF
SO pin bit 6
Under development
Fig. 10-28 Transmit Data Retention Time at the End of Transmission
8-bit receive mode
TMPM330 (rev 0.4) 10-35
TMPM330
Set the control register to the receive mode. Then writing “1” to SBIxCR1 enables
reception. Data is taken into the shift register from the SI pin, with the least-significant bit
(LSB) first, in synchronization with the serial clock. Once the shift register is loaded with the
8-bit data, it transfers the received data to SBIxDBR and the INTSBIx (buffer-full) interrupt
request is generated to request reading the received data. The interrupt service program
then reads the received data from SBIxDBR.
In the internal clock mode, the serial clock will be stopped and automatically be in the wait
state until the received data is read from SBIxDBR.
In the external clock mode, shift operations are executed in synchronization with the
external clock. The maximum data transfer rate varies, depending on the maximum latency
between generating the interrupt request and reading the received data.
Reception can be terminated by clearing to “0” or setting to “1” in the
INTSBIx interrupt service program. If is cleared, reception continues until all the
bits of received data are written to SBIxDBR. The program checks SBIxSR to
determine whether reception has come to an end. is cleared to “0” at the end of
reception. After confirming the completion of the reception, last received data is read. If
is set to “1,” the reception is aborted immediately and is cleared to “0.”
(The received data becomes invalid, and there is no need to read it out.)
(Note) The contents of SBIxDBR will not be retained after the transfer mode is
changed. The ongoing reception must be completed by clearing to
“0” and the last received data must be read before the transfer mode is
changed.
7 6 5 4 3 2 1 0
SBIxCR1 ← 0 1 1 1 0 X X X Selects the receive mode.
SBIxCR1 ← 1 0 1 1 0 0 0 0 Starts reception.
INTSBIx interrupt
bit 7
tSODH = Min. 3.5/fsys/2 [s]
Reg. ← SBIxDBR Reads the received data.
Serial Bus Interface (SBI)