Section 23 Serial Protocol Interface (HSPI)
Rev.1.00 Dec. 13, 2005 Page 861 of 1286
REJ09B0158-0100
23.4 Operation
23.4.1
Operation Overview without DMA (FIFO Mode Disabled)
Figure 23.2 shows the flow of a transmit/receive operation procedure.
Yes
No
No
Yes
Start
Reset the system
Select master or slave
operation by setting the MASL bit
in SPSCR
Select required interrupts by
setting TFIE and ROIE bits in
SPSCR
Check if
TXBUFF is empty by
reading the TXFL bit
in SPSR
Write data to SPTBR
TX/RX data to/from slave
Another
transmit required?
End
Figure 23.2 Operational Flowchart
Depending on the settings of SPCR, the master transmits data to the slave on either the falling or
rising edge of HSPI_CLK and samples data from the slave on the opposite edge. The data transfer
between the master and slave completes when the transmit complete status flag (TXFN) in SPSR
is set to 1. This flag should be used to identify when an HSPI transfer event (byte transmitted and
byte received) has occurred, even in the case where the HSPI module is being used to receive data
only (null data being transmitted). By default data is transmitted MSB first, but LSB first is also
possible depending on how the LMSB bit in SPSCR is set.
Содержание SH7780 Series
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