Motorola DSP56305 User Manual page 625

Application:
HOST (HI08)
Receive Request Enable
DMA Off
DMA On
Transmit Request Enable
DMA Off
DMA On
HDRQ HREQ/HTRQ HACK/HRRQ
0 HREQ
1 HTRQ
Host Flags
Write Only
Host Little Endian
Initialize (Write Only)
0 = ÷ No Action
Receive Data Register Full
0 = Wait
Transmit Data Register Empty
0 = Wait
Transmitter Ready
0 = Data in HI
Host Flags
Read Only
DMA Status
0 = ÷ DMA Disabled
Host Request
0 = ÷ HREQ Deasserted 1 = ÷ HREQ Asserted
Figure D-9 Interrupt Control and Interrupt Status Registers
MOTOROLA
Processor Side
0 = ÷ Interrupts Disabled
1 = Interrupts Enabled
0 = Host → DSP 1 = DSP → Host
0 = ∏ Interrupts Disabled
1 = Interrupts Enabled
0 = DSP → Host 1 = Host → DSP
HACK
HRRQ
1 = ÷ Initialize DMA
Interrupt Control Register (ICR)
1 = Read
1 = Write
1 = Data Not in HI
1 = ÷ DMA Enabled
Interrupt Status Register (ISR)
$2 Read/Write
DSP56305 User's Manual
PROGRAMMING REFERENCE
7 6 5
INIT * HLEND
0
X:$
Read/Write
Reset = $0
7 6 5
*
HREQ DMA
0
Reset = $06
= Reserved, Program as 0
*
Date:
Programmer:
Sheet 4 of 6
4 3 2 1 0
HF1 HF0 HDRQ TREQ RREQ
4 3 2 1 0
HF3 HF2 TRDY TXDE RXDF
D-25