ST18D952 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST18D952' PDF : 67 Pages View PDF
ST18952
10 SIO
The ST18952 has two synchronous serial input/output (SIO) ports which link to serial devices
such as codecs and to other processors.
The SIO ports work in DMA mode. SIO0 uses channels 0 and 1 of the DMA controller, SIO1
uses channels 2 and 3. The chip must be configured for SIO using the DMAR system register
(”DMAR: DMA management register” on page 44). For SIO port 0, bits 1 and 0 of the DMAR
register must be reset to inhibit external DMA requests (1 and 0) and to allow SIO port 0
communication with the outside. For SIO port 1, bits 3 and 2 of the DMAR register must be
reset to inhibit external DMA requests (3 and 2) and to allow SIO port 1 communication with
the outside.
The SIO ports have the following features:
• double-buffered full-duplex operation
• frequency up to D950 input clock (33 Mbps for 66 MHz D950)
• programmable functions
• word length: 8/16 bits (msb first)
• up to 8 words per frame
• frequency prescaler (by 1 or 3) and divider (by 21 to 28)
• synchronization signal: bit length/word length, delayed/not delayed, active level
• clock signal: internal/external, active edge
• 4 status flags / 2 enabled interrupt requests
• data transfers between SIO and memories using DMA
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