Section 18 Serial Sound Interface (SSI)
Rev. 0.50 May 18, 2006 Page 884 of 1588
REJ09B0313-0050
18.5 Usage
Notes
18.5.1
Limitations from Overflow during Receive DMA Operation
If an overflow occurs while the receive DMA is in operation, the module should be restarted. The
receive buffer in the SSI consists of 32-bit registers that share the L and R channels. Therefore,
data to be received at the L channel may sometimes be received at the R channel if an overflow
occurs, for example, under the following condition: the control register (SSICR) has a 32-bit
setting for both data word length (DWL2 to DWL0) and system word length (SWL2 to SWL).
If an overflow is confirmed with the overflow error interrupt or overflow error status flag (the
OIRQ bit in SSISR), write 0 to the EN bit in SSICR and DMEN bit to disable DMA in the SSI
module, thus stopping the operation. (In this case, the controller setting should also be stopped.)
After this, write 0 to the OIRQ bit to clear the overflow status, set DMA again and restart the
transfer.
18.5.2
Note on Using Oversampling Clock
To use the externally input clock as the oversampling clock, refer to section 4.6.1, Note on
Inputting External Clock, in which the terms EXTAL and XTAL pins should be replaced by the
AUDIO_X1 and AUDIO_X2 pins respectively.
To use the crystal resonator, refer to section 4.6.2, Note on Using an External Crystal Resonator,
in which the terms EXTAL and XTAL pins should be replaced by the AUDIO_X1 and
AUDIO_X2 pins respectively.
Also, see section 4.6.3, Note on Resonator.
Содержание Single-Chip Microcomputer SH7203
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