Serial Port Registers
A-46 ADSP-21368 SHARC Processor Hardware Reference
SPORT Active Channel Select Registers (SPxCSy)
Each bit, 31–0, set (= 1) in one of the four SPxCSy registers corresponds to
the active channel, 127–0, on a multichannel mode serial port. When the
SPxCSy registers activate a channel, the serial port transmits or receives the
word in that channel’s position of the data stream. When a channel’s bit
in the SPxCSy register is cleared (= 0), the serial port’s data transmit pin
three-states during the channel’s transmit time slot if the serial port is con-
figured as transmitter. If the serial port is configured as the receiver it
ignores the incoming data. The addresses of the SPxCSy registers are:
The reset value for these registers is undefined.
SP0CS0 – 0xC05 SP0CS1 – 0xC06
SP0CS2 – 0xC07 SP0CS3 – 0xC08
SP2CS0 – 0x405 SP2CS1 – 0x406
SP2CS2 – 0x407 SP2CS3 – 0x408
SP4CS0 – 0x805 SP4CS1 – 0x806
SP4CS2 – 0x807 SP4CS3 – 0x808
SP6CS0 – 0x4805 SP6CS1 – 0x4806
SP6CS2 – 0x4807 SP64CS3 – 0x4808
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