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Serial Audio Interface
Serial Audio Interface Programming Model
MOTOROLA
DSP56012 User’s Manual
6-9
6.3.1
Baud Rate Control Register (BRC)
The serial clock frequency is determined by the control bits in the Baud Rate Control
register (BRC) as described in the following paragraphs. The BRC is illustrated in
Figure 6-4
on page 6-8. The maximum allowed internally generated bit clock
frequency is f
osc
/4 and the maximum allowed external bit clock frequency is f
osc
/3.
BRC bits should be modified only when the baud-rate generator is disabled (i.e.,
when both receiver and transmitter sections are defined as slaves or when both are in
the individual reset state); otherwise improper operation may result. When read by
the DSP, the BRC appears on the two low-order bytes of the 24-bit word, and the
high-order byte is read as 0s. The BRC is cleared during hardware reset and software
reset.
Table 6-1
SAI Interrupt Vector Locations
Interrupt
TXIL = 0
TXIL = 1
RXIL = 0
RXIL = 1
Left Channel Transmit
P: $0010
P: $0040
—
—
Right Channel Transmit
P: $0012
P: $0042
—
—
Transmit Exception
P: $0014
P: $0044
—
—
Left Channel Receive
—
—
P: $0016
P: $0046
Right Channel Receive
—
—
P: $0018
P: $0048
Receive Exception
—
—
P: $001A
P: $004A
Table 6-2
SAI Internal Interrupt Priorities
Priority
Interrupt
Highest
SAI Receive
SAI Transmit
SAI Left Channel Receive
SAI Left Channel Transmit
SAI Right Channel Receive
Lowest
SAI Right Channel Transmit
Summary of Contents for DSP56012
Page 12: ...xii Motorola ...
Page 20: ...xx Motorola ...
Page 21: ...MOTOROLA DSP56012 User s Manual 1 1 SECTION 1 OVERVIEW ...
Page 40: ...1 20 DSP56012 User s Manual MOTOROLA Overview DSP56012 Architectural Overview ...
Page 41: ...MOTOROLA DSP56012 User s Manual 2 1 SECTION 2 SIGNAL DESCRIPTIONS ...
Page 61: ...SECTION 3 MEMORY OPERATING MODES AND INTERRUPTS ...
Page 81: ...MOTOROLA DSP56012 User s Manual 4 1 SECTION 4 PARALLEL HOST INTERFACE ...
Page 148: ...4 68 DSP56012 User s Manual MOTOROLA Parallel Host Interface Host Interface HI ...
Page 149: ...MOTOROLA DSP56012 User s Manual 5 1 SECTION 5 SERIAL HOST INTERFACE ...
Page 179: ...MOTOROLA DSP56012 User s Manual 6 1 SECTION 6 SERIAL AUDIO INTERFACE ...
Page 205: ...MOTOROLA DSP56012 User s Manual 7 1 SECTION 7 GPIO ...
Page 210: ...7 6 DSP56012 User s Manual MOTOROLA GPIO GPIO Register GPIOR ...
Page 211: ...MOTOROLA DSP56012 User s Manual 8 1 SECTION 8 DIGITAL AUDIO TRANSMITTER ...
Page 226: ...8 16 DSP56012 User s Manual MOTOROLA Digital Audio Transmitter DAX Programming Considerations ...
Page 233: ...MOTOROLA DSP56012 User s Manual B 1 APPENDIX B PROGRAMMING REFERENCE ...