HOST INTERFACE (HI32)
DSP SIDE Programming Model
MOTOROLA
DSP56305 User’s Manual
6-47
6.5.13
DSP Host Port GPIO Direction Register (DIRH)
The DIRH is a 24-bit read/write register used by the DSP56300 core to control the
direction of the host port signals in GPIO mode. The DIRH cannot be accessed by the
host processor.
DIR23-DIR0 are used to define the corresponding GPIO signals as input or output. The
functionality of the DIR23-DIR0 bits is defined in Table 6-10.
Hardware and software resets clear all DIRH bits.
Table 6-10
DATH and DIRH Functionality
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DIR
23
DIR
22
DIR
21
DIR
20
DIR
19
DIR
18
DIR
17
DIR
16
DIR
15
DIR
14
DIR
13
DIR
12
DIR
11
DIR
10
DIR
9
DIR
8
DIR
7
DIR
6
DIR
5
DIR
4
DIR
3
DIR
2
DIR
1
DIR
0
Bit
Name
Function
23-0
DIR23-DIR0
GPIO Signal Direction
DIR
x
DATx
GPIO signal
a
a.
defined by the selected mode
non-GPIO signal
a
0
Read only bit. The value read is the binary
value of the signal.
The corresponding signal is configured as
an input.
Read only bit. Does not contain significant
data.
1
Read/write bit. The value written is the
value read. The corresponding signal is
configured as an output, and is driven
with the data written to DATx.
Read/write bit. The value written is the
value read.
Содержание DSP56305
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