B-20 DSP56012 User’s Manual MOTOROLA

Programming Reference
Sheet 2 of 5
Application: Date:
Programmer:
Host Status Register (HSR)
HTDEHCP HRDFHF1 HF0
6543210723
* = Reserved, write as 0
• • •
*
0*
0*
0
Host Status Register (HSR)
X:$FFE9 Read Only
Reset = $000002
Host Receive Data Full (HRDF)
0 = wait/1 = read
Host Transmit Data Empty (HTDE)
0 = wait/1 = write
Host Command Pending (HCP)
0 = wait/1 = ready
Host Flags (HFO, HF1)
read only
DMA
DMA Status (DMA)
0 = disabled/1 = enabled
15 654321010987
14 13 12 11
19 18 17 1623 22 21 20
Receive Middle Byte Receive Low ByteReceive High Byte
Host Receive Data Register (HORX)
X:$FFEB Read Only
Reset = $000000 Host Receive Data (Usually Read by Program)
Host Receive Data Register (HORX)
15 654321010987
14 13 12 11
19 18 17 1623 22 21 20
Receive Middle Byte Receive Low ByteReceive High Byte
Host Transmit Data Register (HOTX)
X:$FFEB Write Only
Reset = $000000 Host Transmit Data (Usually Loaded by Program)
Host Transmit Data Register (HOTX)

DSP Side

HI
read only