Figure 4-20 Hi Initialization-Host Side, Interrupt Mode - Motorola DSP56012 User Manual

Parallel Host Interface
Host Interface (HI)
Step 2 Of HI Port Configuration
2. Option 3: Select Interrupt Mode For:
Initialize DSP
Initialize HI
Bit 7 = 1
DMA Off
Bit 5 = 0
Bit 6 = 0
7 6
$0
INIT HM1
2. Option 4: Load HI Interrupt vector if using the interrupt mode and the host processor requires an interrupt
vector.
7 6
$3 IV7 IV6
Reserved; write as 0
Figure 4-20 HI Initialization—Host Side, Interrupt Mode
4-44
DSP To Host
Optional
5 4 3 2
HM0 HF1 HF0
5 4 3 2
IV5 IV3 IV2 IV2
DSP56012 User's Manual
Receive Data Full Interrupt
DSP To Host
Or
Transmit Data Empty Interrupt
Host To DSP
Or
Receive Data Full Interrupt And
And Transmit Data Empty Interrupt
Host To DSP
1 0
Interrupt Control Register (ICR)
TREQ RREQ
(Read/Write)
1 0
Interrupt Vector Register (IVR)
IV1 IV0
(Read/Write)
Enable
Bit 0 = 1
Bit 1 = 0
Enable
Bit 0 = 0
Bit 1 = 1
Enable
Bit 0 = 1
Bit 1 = 1
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