7-16
DSP56309UM/D MOTOROLA
Enhanced Synchronous Serial Interface (ESSI)
ESSI Programming Model
Bit OF0 is cleared by a hardware RESET signal or by a software RESET instruction.
7.4.2.1.2
CRB Serial Output Flag 1 (OF1) Bit 1
When the ESSI is in synchronous mode and transmitter 2 is disabled (TE2 = 0), the SC1
signal is configured as ESSI flag 1. If the serial control direction bit (SCD1) is set, the SC1
signal is an output. Data present in bit OF1 is written to SC1 at the beginning of the
frame in normal mode or at the beginning of the next time slot in network mode.
Bit OF1 is cleared by a hardware RESET signal or by a software RESET instruction.
7.4.2.2
CRB Serial Control Direction 0 (SCD0) Bit 2
In synchronous mode (SYN = 1) when transmitter 1 is disabled (TE1 = 0), or in
asynchronous mode (SYN = 0), SCD0 controls the direction of the SC0 I/O signal. When
SCD0 is set, SC0 is an output; when SCD0 is cleared, SC0 is an input.
When TE1 is set, the value of SCD0 is ignored, and the SC0 signal is always an output.
Bit SCD0 is cleared by a hardware RESET signal or by a software RESET instruction.
7.4.2.3
CRB Serial Control Direction 1 (SCD1) Bit 3
In synchronous mode (SYN = 1) when transmitter 2 is disabled (TE2 = 0), or in
asynchronous mode (SYN = 0), SCD1 controls the direction of the SC1 I/O signal. When
SCD1 is set, SC1 is an output; when SCD1 is cleared, SC1 is an input.
When TE2 is set, the value of SCD1 is ignored, and the SC1 signal is always an output.
Bit SCD1 is cleared by a hardware RESET signal or by a software RESET instruction.
7.4.2.4
CRB Serial Control Direction 2 (SCD2) Bit 4
SCD2 controls the direction of the SC2 I/O signal. When SCD2 is set, SC2 is an output;
when SCD2 is cleared, SC2 is an input. SCD2 is cleared by a hardware RESET signal or
by a software RESET instruction.
7.4.2.5
CRB Clock Source Direction (SCKD) Bit 5
SCKD selects the source of the clock signal. If SCKD is set and the ESSI is in synchronous
mode, the internal clock is the source of the clock signal used for all the transmit shift
registers and the receive shift register. If SCKD is set and the ESSI is in asynchronous
mode, the internal clock source becomes the bit clock for the transmit shift register and
word length divider. The internal clock is output on the SCK signal.
When SCKD is cleared, the external clock source is selected. The internal clock generator
is disconnected from the SCK signal, and an external clock source can drive this signal.
Either a hardware RESET signal or a software RESET instruction clears SCKD.
Summary of Contents for DSP56309
Page 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Page 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
Page 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Page 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Page 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Page 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Page 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Page 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Page 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Page 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Page 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Page 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Page 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Page 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Page 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Page 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Page 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Page 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Page 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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