7-36
DSP56309UM/D MOTOROLA
Enhanced Synchronous Serial Interface (ESSI)
Operating Modes
When the RSMA or RSMB register are read by the internal data bus, the register contents
occupy the two low-order bytes of the data bus, and the high-order byte is zero-filled.
After a hardware RESET signal or a software RESET instruction, the RSM register is reset
to $FFFFFFFF; this setting enables all thirty-two time slots for data transmission.
7.5
OPERATING MODES
The ESSI operating modes are selected by the ESSI control registers (CRA and CRB). The
operating modes are described in the following paragraphs.
7.5.1
ESSI After Reset
A hardware RESET signal or software RESET instruction clears the port control register
and the port direction control register. This situation configures all the ESSI signals as
GPIO. The ESSI is in the reset state while all ESSI signals are programmed as GPIO; the
ESSI is active only if at least one of the ESSI I/O signals is programmed as an ESSI signal.
7.5.2
ESSI Initialization
To initialize the ESSI, do the following:
1. Send a reset: a hardware RESET signal, software RESET instruction, ESSI
individual reset, or STOP instruction.
2. Program the ESSI control and time slot registers.
3. Write data to all the enabled transmitters.
4. Configure at least one signal as an ESSI signal.
5. If an external frame sync is used, from the moment the ESSI is activated, at least
five serial clocks are needed before the first external frame sync is supplied.
Otherwise, improper operation can result.
Clearing the PC[5:0] bits in the GPIO PCR during program execution causes the ESSI to
stop serial activity and enter the individual reset state. All status bits of the interface are
set to their reset state. The contents of CRA and CRB are not affected. The ESSI
individual reset allows a program to reset each interface separately from the other
Содержание DSP56309
Страница 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Страница 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
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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