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DSP56857 Datasheet(PDF) 421 Page - Freescale Semiconductor, Inc

Part # DSP56857
Description  Digitial Signal Controller
PDF  662 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 421 Page - Freescale Semiconductor, Inc

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Register Descriptions
General Purpose Input/Output (GPIO), Rev. 4
Freescale Semiconductor
15-21
15.8.24 Port H Data Register (GPIOH_DR)
Figure 15-33. Port H Data Register (GPIOH_DR)
See Programmer’s Sheet on Appendix page B - 128
15.8.24.1 Reserved—Bits 15–3
These bits are reserved or not implemented. They are read as 0 and cannot be modified by
writing.
15.8.24.2 Data (DATA)—Bits 2–0
These bits control the output data when in GPIO mode.
15.8.25 Port A Pull-Up Enable Register (GPIOA_PUER)
Figure 15-34. Port A Pull-Up Enable Register (GPIOA_PUER)
See Programmer’s Sheet on Appendix page B - 129
15.8.25.1 Reserved—Bits 15–4
These bits are reserved or not implemented. They are read as 0 and cannot be modified by
writing.
15.8.25.2 Pull-Up Enable (PUE)—Bits 3–0
These bits control whether pull-ups are enabled for inputs in either Normal or GPIO mode.
Pull ups are automatically disabled for outputs in both modes.
•
0 = Pull ups disabled for inputs
•
1 = Pull ups enabled for inputs (default)
Base + $2
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
0
0
0
0
0
0
0
0
0
0
0
0
0
DATA
Write
Reset
00
000
00
0
0
0
0
0
0
0
0
0
Base + $3
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
1
1
1
1
1
1
1
1
1
1
1
1
PUE
Write
Reset
11
111
11
1
1
1
1
1
1
1
1
1



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