Host Interface (HI08)
HI08-External Host ProgrammerÕs Model
MOTOROLA
DSP56309UM/D 6-23
6.6.1.1
ICR Receive Request Enable (RREQ) Bit 0
The RREQ bit controls the HREQ signal for host receive data transfers. RREQ enables
host requests via the host request (HREQ or HRRQ) signal when the receive data register
full (RXDF) status bit in the ISR is set. If RREQ is cleared, RXDF interrupts are disabled.
If RREQ and RXDF are set, the host request signal (HREQ or HRRQ) is asserted.
6.6.1.2
ICR Transmit Request Enable (TREQ) Bit 1
TREQ enables host requests via the host request (HREQ or HTRQ) signal when the
transmit data register empty (TXDE) status bit in the ISR is set. If TREQ is cleared, TXDE
interrupts are disabled. If TREQ and TXDE are set, the host request signal is asserted.
and
summarize the effect of RREQ and TREQ on the HREQ and
HRRQ signals.
6.6.1.3
ICR Double Host Request (HDRQ) Bit 2
If cleared, the HDRQ bit configures HREQ/HTRQ and HACK/HRRQ as HREQ and
HACK, respectively. If HDRQ is set, HREQ/HTRQ and HACK/HRRQ are configured
as HTRQ and HRRQ, respectively.
Table 6-8
TREQ and RREQ modes (HDRQ = 0)
TREQ
RREQ
HREQ Signal
0
0
No Interrupts (Polling)
0
1
RXDF Request (Interrupt)
1
0
TXDE Request (Interrupt)
1
1
RXDF and TXDE Request (Interrupts)
Table 6-9
TREQ and RREQ modes (HDRQ = 1)
TREQ
RREQ
HTRQ Single
HRRQ Signal
0
0
No Interrupts (Polling)
No Interrupts (Polling)
0
1
No Interrupts (Polling)
RXDF Request (Interrupt)
1
0
TXDE Request (Interrupt)
No Interrupts (Polling)
1
1
TXDE Request (Interrupt)
RXDF Request (Interrupt)
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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