r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1171

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

In clocked synchronous serial communication, data on the communication line is output from one
fall of the synchronization clock to the next fall. Data is guaranteed to be accurate at the start of
the synchronization clock.
In serial communication, each character is output starting with the LSB and ending with the MSB.
After the MSB is output, the communication line remains in the state of the last data.
In clocked synchronous mode, the SCIF receives data in synchronization with the rise of the
synchronization clock.
(1)
A fixed 8-bit data format is used. No parity bit can be added.
(2)
Either an internal clock generated by the on-chip baud rate generator or an external
synchronization clock input at the SCIF_SCK pin can be selected as the SCIF's serial clock,
according to the settings of the C/A bit in SCSMR and the CKE1 and CKE0 bits in SCSCR. For
details of SCIF clock source selection, see table 27.6.
When the SCIF is operated on an internal clock, the synchronization clock is output from the
SCIF_SCK pin. Eight synchronization clock pulses are output in the transfer of one character, and
when no transfer is performed the clock is fixed high. When an internal clock is selected in a
receive operation only, as long as the RE bit in SCSCR is set to 1, clock pulses are output until the
number of receive data bytes in the receive FIFO data register reaches the receive trigger number.
(3)
Before transmitting and receiving data, it is necessary to clear the TE and RE bits in SCSCR to 0,
then initialize the SCIF as described below.
When changing the operating mode or transfer format, etc., the TE and RE bits must be cleared to
0 before making the change using the following procedure. When the TE bit is cleared to 0,
SCTSR is initialized. Note that clearing the RE bit to 0 does not initialize the RDF, PER, FER, or
ORER flag state or change the contents of SCFRDR.
Figure 27.16 shows a sample SCIF initialization flowchart.
Data Transfer Format
Clock
SCIF Initialization (Clocked Synchronous Mode):
Section 27 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Oct. 01, 2007 Page 1105 of 1956
REJ09B0256-0100