Host Interface (HI08)
HI08-External Host ProgrammerÕs Model
MOTOROLA
DSP56309UM/D 6-27
6.6.3.2
ISR Transmit Data Register Empty (TXDE) Bit 1
The TXDE bit indicates that the transmit byte registers (TXH:TXM:TXL) are empty and
can be written by the host processor. TXDE is set when the contents of the transmit byte
registers are transferred to the HRX register. TXDE is cleared when the transmit (TXL or
TXH according to HLEND bit) register is written by the host processor. The host
processor can set TXDE using the initialize function. TXDE can assert the external HTRQ
signal if the TREQ bit is set. Regardless of whether the TXDE interrupt is enabled, TXDE
indicates whether the TX registers are full and data can be latched in so that the host
processor can use polling techniques.
6.6.3.3
ISR Transmitter Ready (TRDY) Bit 2
The TRDY status bit indicates that TXH:TXM:TXL, and the HRX registers are empty.
TRDY = TXDE
and
HRDF
If TRDY is set, the data that the host processor writes to TXH:TXM:TXL is immediately
transferred to the DSP side of the HI08. This feature has many applications. For example,
if the host processor issues a host command which causes the DSP56309 to read the
HRX, the host processor can be guaranteed that the data it just transferred to the HI08 is
that being received by the DSP56309.
6.6.3.4
ISR Host Flag 2 (HF2) Bit 3
HF2 indicates the state of host flag 2 in the HCR on the DSP side. HF2 can be changed
only by the DSP56309, as documented in
Section 6.5.3.4ÑHCR Host Flags 2,3 (HF[3:2])
6.6.3.5
ISR Host Flag 3 (HF3) Bit 4
HF3 indicates the state of Host Flag 3 in the HCR on the DSP side. HF3 can be changed
only by the DSP56309, as documented in
Section 6.5.3.4ÑHCR Host Flags 2,3 (HF[3:2])
6.6.3.6
ISR Reserved
Bits 5, 6
These bits are reserved. They are read as 0 and should be written with 0.
6.6.3.7
ISR Host Request (HREQ) Bit 7
HREQ indicates the status of the external transmit and receive request output signals
(HTRQ and HRRQ) if HDRQ is set. If HDRQ is cleared, it indicates the status of the
external host request output signal (HREQ).
HRDQ and HDEQ and their effects.
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 ...
Страница 405: ......
Страница 409: ......