MOTOROLA
B - 17
Application:
Date:
Programmer:
Sheet 2 of 5
HOST
*
= Reserved, Program as zero
Host Status Register (HSR)
X:$FFE9 Read Only
Reset = $000002
4
3
2
1
0
HF1
HF0
HCP HTDE HRDF
Host Transmit Data Empty
0 =
∏
Wait
1 =
∏
Write
Host Command Pending
0 =
∏
Wait
1 =
∏
Ready
DMA Status (Read Only)
0 =
∏
Disabled
1 =
∏
Enabled
Host Flags
Read Only
Host Receive Data Full
0 =
∏
Wait
1 =
∏
Read
7
DMA
6
5
* *
0
0
DSP SIDE
Host Receive Data Register (HRX)
X:$FFEB Read Only
Reset = $000000
Host Transmit Data Register (HTX)
X:$FFEB Write Only
Reset = $000000
Host Transmit Data (usually loaded by program)
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
TRANSMIT MIDDLE BYTE
TRANSMIT LOW BYTE
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RECEIVE MIDDLE BYTE
RECEIVE LOW BYTE
Host Receive Data (usually Read by program)
23 22 21 20 19 18
17 16
RECEIVE HIGH BYTE
23 22 21 20 19 18
17 16
TRANSMIT HIGH BYTE
•
•
•
23
*
0
Figure B-17 Host Transmit Data Register (HTX)
Figure B-16 Host Receive Data Register (HRX)
Figure B-15 Host Status Register (HSR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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