Motorola DSP56012 - Manual (Page 253)

Programming Reference
MOTOROLA DSP56012 User’s Manual B-21
Sheet 3 of 5
Application: Date:
Programmer:
TREQ HMO RREQ HF1 HF0
6 5 4 3 2 1 0 7
* = Reserved, write as 0
*
0
Receive Request Enable (RREQ)
DMA Off: 0 = interrupts disabled/1 = interrupts enabled
Processor Side
INIT
Interrupt Control Register (ICR)
Interrupt Control Register (ICR)
$0 Read/Write
Reset = $00
DMA On: 0 = Host
→
DSP/1 = DSP
→
Host
Transmit Request Enable (TREQ)
DMA Off: 0 = interrupts disabled/1 = interrupts enabled
DMA On: 0 = DSP
→
Host/1 = Host
→
DSP
Host Flags (HF0, HF1)
Write Only
Host Mode Control (HM0, HM1)
00 = DMA off/01 = 24 Bit DMA
10 = 16 Bit DMA/11 = 8 Bit DMA
Initialize (INIT)
0 = no action/1 = initialize DMA
HM1
HV1 HV5 HV0 HV4 HV3
6 5 4 3 2 1 0 7
* = Reserved, write as 0
*
0
HC
Command Vector Register (CVR)
Host Command (HC)
0 = Idle/1 = Interrupt DSP
HV2
Host Vector (HV[5:0])
Executive Interrupt Routine 0-63
Command Vector Register (CVR)
$1 Read/Write
Reset = $17
HI
Write Only