6-26
DSP56309UM/D MOTOROLA
Host Interface (HI08)
HI08-External Host ProgrammerÕs Model
IRQA, IRQB, etc.) and can use any of the reserved or otherwise unused addresses
(provided they have been pre-programmed in the DSP). HV is set to $32 (vector location
$0064) by a hardware RESET signal, software RESET instruction, individual reset, or a
STOP instruction.
6.6.2.2
CVR Host Command Bit (HC) Bit 7
The host processor uses the HC bit to handshake the execution of host command
interrupts. Normally, the host processor sets HC to request a host command interrupt
from the DSP56309. When the DSP56309 acknowledges the host command interrupt, the
HI08 hardware clears the HC bit. The host processor can read the state of HC to
determine when the host command has been accepted. After setting HC, the host must
not write to the CVR again until the HI08 hardware clears HC. Setting the HC bit causes
host command pending (HCP) to be set in the HSR. The host can write to the HC and HV
bits in the same write cycle.
6.6.3
Interface Status Register (ISR)
The interface status register (ISR) is an 8-bit, read-only status register used by the host
processor to interrogate the status and flags of the HI08. The host processor can write to
this address without affecting the internal state of the HI08. The DSP core cannot access
the ISR. The ISR bits are described in the following paragraphs. This register is
illustrated in
6.6.3.1
ISR Receive Data Register Full (RXDF) Bit 0
The RXDF bit indicates that the receive byte registers (RXH:RXM:RXL) contain data
from the DSP56309 and can be read by the host processor. RXDF is set when the HTX is
transferred to the receive byte registers. RXDF is cleared when the receive data (RXL or
RXH according to HLEND bit) register is read by the host processor. RXDF can be
cleared by the host processor using the initialize function. RXDF can assert the external
HREQ signal if the RREQ bit is set. Regardless of whether the RXDF interrupt is enabled,
RXDF indicates whether the RX registers are full and data can be latched out so that the
host processor can use polling techniques.
7
6
5
4
3
2
1
0
HREQ
HF3
HF2
TRDY
TXDE
RXDF
ÑReserved bit. Read as 0. Should be written with 0, for future compatibility.
AA0670
Figure 6-14
Interface Status Register
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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