8-8
DSP56309UM/D MOTOROLA
Serial Communication Interface (SCI)
SCI Programming Model
8.3.1
SCI Control Register (SCR)
The SCR is a 24-bit, read/write register that controls the serial interface operation.
Seventeen of the twenty-four bits are currently defined. Each bit is described in the
following paragraphs.
8.3.1.1
SCR Word Select (WDS[0:2]) Bits 0Ð2
The word select WDS[0:2] bits select the format of transmitted and received data. Format
modes are listed in
Asynchronous modes are compatible with most UART-type serial devices and support
standard RS232C communication links. Multidrop asynchronous mode is compatible
with the MC68681 DUART, the M68HC11 SCI interface, and the Intel 8051 serial
interface. Synchronous data mode is essentially a high-speed shift register used for I/O
expansion and stream-mode channel interfaces. A gated transmit and receive clock
compatible with the Intel 8051 serial interface mode 0 makes it possible for you to
synchronize data.
When odd parity is selected, the transmitter counts the number of 1s in the data word. If
the total is not an odd number, the parity bit is set, thus producing an odd number. If the
receiver counts an even number of 1s, an error in transmission has occurred. When even
parity is selected, an even number must result from the calculation performed at both
ends of the line, or an error in transmission has occurred.
Table 8-1
Word Formats
WDS2
WDS1
WDS0
Mode
Word Formats
0
0
0
0
8-bit synchronous data (shift register mode)
0
0
1
1
Reserved
0
1
0
2
10-bit asynchronous (1 start, 8 data, 1 stop)
0
1
1
3
Reserved
1
0
0
4
11-bit asynchronous
(1 start, 8 data, 1 even parity, 1 stop)
1
0
1
5
11-bit asynchronous
(1 start, 8 data, 1 odd parity, 1 stop)
1
1
0
6
11-bit multidrop asynchronous
(1 start, 8 data, 1 data type, 1 stop)
1
1
1
7
Reserved
Содержание DSP56309
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Страница 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Страница 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Страница 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Страница 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Страница 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Страница 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Страница 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Страница 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Страница 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Страница 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Страница 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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