LM3S3748 Datasheet, PDF (91/753 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S3748 Microcontroller
Register 10: GPIO High Speed Control (GPIOHSCTL), offset 0x06C
This register provides the user the ability to change the GPIO ports to run on a single-cycle bus
equivalent to the processor clock instead of the legacy bus with two-cycle access. The address
aperture in the memory map will change for the ports that are enabled for high-speed access (see
Table 10-3 on page 257).
GPIO High Speed Control (GPIOHSCTL)
Base 0x400F.E000
Offset 0x06C
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
PORTHHS PORTGHS PORTFHS PORTEHS PORTDHS PORTCHS PORTBHS PORTAHS
Type RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:8
7
6
5
4
3
2
1
Name
reserved
PORTHHS
PORTGHS
PORTFHS
PORTEHS
PORTDHS
PORTCHS
PORTBHS
Type
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0x0
0
0
0
0
0
0
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Port H High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port G High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port F High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port E High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port D High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port C High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
Port B High-Speed
When set, the memory aperture for Port H is selected to be high speed
(single-cycle). Otherwise, the legacy aperture (two-cycle) is chosen.
April 08, 2008
91
Preliminary