6-28
DSP56309UM/D MOTOROLA
Host Interface (HI08)
HI08-External Host ProgrammerÕs Model
Table 6-11
HREQ and HDRQ Settings
The HREQ is set from either or both of two conditionsÑeither the receive byte registers
are full or the transmit byte registers are empty. These conditions are indicated by the
ISR RXDF and TXDE status bits, respectively. If the interrupt source has been enabled by
the associated request enable bit in the ICR, HREQ is set if one or more of the two
enabled interrupt sources is set.
6.6.4
Interrupt Vector Register (IVR)
The IVR is an 8-bit, read/write register which typically contains the interrupt vector
number used with MC68000 family processor vectored interrupts. Only the host
processor can read and write this register. The contents of the IVR are placed on the host
data bus, H[7:0], when both the HREQ and HACK signals are asserted. The contents of
this register are initialized to $0F by a hardware RESET signal or software RESET
instruction. This value corresponds to the uninitialized interrupt vector in the MC68000
family. This register is illustrated in
6.6.5
Receive Byte Registers (RXH: RXM: RXL)
The receive byte registers are viewed by the host processor as three 8-bit, read-only
registers. These registers are the receive high register (RXH), the receive middle register
(RXM), and the receive low register (RXL). They receive data from the high, middle, and
HDRQ
HREQ
Effect
0
0
HREQ is cleared; no host processor interrupts are requested.
0
1
HREQ is set; an interrupt is requested.
1
0
HTRQ and HRRQ are cleared, no host processor interrupts are
requested.
1
1
HTRQ or HRRQ are set; an interrupt is requested.
7
6
5
4
3
2
1
0
IV7
IV6
IV5
IV4
IV3
IV2
IV1
IV0
AA0671
Figure 6-15
Interrupt Vector Register (IVR)
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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