Host Interface (HI08)
HI08 DSP Side ProgrammerÕs Model
MOTOROLA
DSP56309UM/D 6-9
transmit data registers (TXH:TXM:TXL on the host side) when both the hostÕs transmit
data register empty (ISR:TXDE) bit and the DSPÕs host receive data full (HSR:HRDF) bits
are cleared. The transfer operation sets both the TXDE and HRDF bits. When the HRDF
bit is set, the HRX register contains valid data. The DSP56309 sets the HRIE bit (HCR, bit
0) to cause a host receive data interrupt when HRDF is set. When the DSP56309 reads the
HRX register, the HRDF bit is cleared.
6.5.2
Host Transmit Data Register (HTX)
The HTX register handles for DSP-to-host data transfers. The DSP56309 views it as a
24-bit write-only register. Its address is X:$FFFFC7. Writing to the HTX register clears
the DSPÕs host transfer data empty (HSR:HTDE) bit. The contents of the HTX register are
transferred as 24-bit data to the receive byte registers (RXH:RXM:RXL) when both the
HTDE and the hostÕs receive data full (ISR:RXDF) bits are cleared. This transfer
operation sets the HTDE and RXDF bits. The DSP56309 sets the HTIE bit to cause a host
transmit data interrupt when HTDE is set. To prevent the previous data from being
overwritten, data should not be written to the HTX until the HTDE bit is set.
Note:
During data writes to a peripheral device, there is a two-cycle pipeline delay
until any status bits affected by this operation are updated. If you read any of
those status bits within the next two cycles, the bit does not reflect its current
status. See the
DSP56300 Family Manual, Appendix B, Polling a Peripheral
Device for Write
for further details.
6.5.3
Host Control Register (HCR)
The HCR is a 16-bit, read/write control register by which the DSP core controls the HI08
operating mode. Initialization values for HCR bits are documented in
Section 6.5.9ÑDSP Side Registers After Reset
. Reserved bits are read as 0 and should
be written with 0 for future compatibility.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
HF3 HF2 HCIE HTIE HRIE
ÑReserved bit, read as 0, should be written with 0 for future compatibility.
AA0658
Figure 6-2
Host Control Register (HCR) (X:$FFFFC2)
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: ......