Stereo System User Manual

Programming Reference
MOTOROLA DSP56012 User’s Manual B-21
Sheet 3 of 5
Application:
Date:
Programmer:
TREQHMO RREQHF1 HF0
65432107
* = 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
HV1HV5 HV0HV4 HV3
65432107
* = 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