Filter
Top Products
Section 28 Sampling Rate Converter
Page 1660 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
(2) When Interrupts are Used to Activate Direct Memory Access Controller
1. Assign IDEI of this module to one channel of the direct memory access controller.
2. Set the IEN bit in SRCIDCTRL to 1.
3. When the IINT bit in SRCSTAT is set to 1, the IDE interrupt request is issued thus activating
the direct memory access controller. When the direct memory access controller has written
data to the SRCID thus resulting in the number of data units in the input data FIFO exceeding
that of the triggering number specified by the IFTRG1 and IFTRG 0 bits in SRCIDCTRL, the
IINT bit is cleared to 0.
4. Repeat step 3 until all the data has been input, and write 1 to the FL bit in SRCCTRL.
(3) When Serial Sound Interface Interrupts are Used for Activating Direct Memory Access
Controller to Transfer Input Data from Serial Sound Interface
1. Assign the serial sound interface to one channel of the direct memory access controller as a
DMA transfer request source. Set SSIFRDR of the serial sound interface as a transfer source
and SRCID of the sampling rate converter as a transfer destination, and set the serial source
interface to enable reception operation.
2. When the RDF bit in SSIFSR is set to 1, the serial sound interface interrupt request is issued
thus activating the direct memory access controller. The direct memory access controller then
reads data from SSIFRDR and writes the data to SRCID.
3. Repeat step 2 until all the data has been input, and write 1 to the FL bit in SRCCTRL.