LM3S101-CRN20-XNPP ETC1 [List of Unclassifed Manufacturers], LM3S101-CRN20-XNPP Datasheet - Page 47
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LM3S101-CRN20-XNPP
Manufacturer Part Number
LM3S101-CRN20-XNPP
Description
Microcontroller
Manufacturer
ETC1 [List of Unclassifed Manufacturers]
Datasheet
1.LM3S101-CRN20-XNPP.pdf
(284 pages)
- Current page: 47 of 284
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System Control
6.1.2.7
6.1.3
6.1.4
6.1.4.1
47
3.
The watchdog reset timing is shown in Figure 17-12 on page 281.
Linear Drop-Out
A reset can be made when the internal linear drop-out (LDO) regulator output goes unregulated.
This is initially disabled and may be enabled by software. LDO is controlled with the LDO Power
Control (LDOPCTL) register (see page 61). The LDO reset sequence is as follows:
1.
2.
3.
The LDO reset timing is shown in Figure 17-13 on page 281.
Power Control
The LDO regulator permits the adjustment of the on-chip output voltage (V
be adjusted in 50 mV increments between the range of 2.25 V through 2.75 V. The adjustment is
made through the VADJ field of the LDO Power Control (LDOPCTL) register (see page 61).
Clock Control
System control determines the clocking and control of clocks in this part.
Fundamental Clock Sources
There are two fundamental clock sources for use in the device:
The internal system clock may be driven by either of the above two reference sources as well as
the internal PLL, provided that the PLL input is connected to a clock source that meets its AC
requirements.
Nearly all of the control for the clocks is provided by the Run-Mode Clock Configuration (RCC)
register (see page 70).
Figure 6-2 shows the logic for the main clock tree. The peripheral blocks are driven by the System
Clock signal and can be programmatically enabled/disabled.
The internal reset is released and the controller fetches and loads the initial stack pointer, the
initial program counter, and the first instruction designated by the program counter, and then
begins execution.
LDO goes unregulated and the LDOARST bit in the LDOARST register is set.
An internal reset is asserted.
The internal reset is released and the controller fetches and loads the initial stack pointer, the
initial program counter, and the first instruction designated by the program counter, and then
begins execution.
The main oscillator, driven from either an external crystal or a single-ended source. As a
crystal, the main oscillator source is specified to run from 1-8 MHz. However, when the crystal
is being used as the PLL source, it must be from 5-8 MHz to meet PLL requirements. As a
single-ended source, the range is from DC to the specified speed of the device.
The boot oscillator, which is an on-chip free running clock. The boot oscillator is specified to
run at 15 MHz ± 30%. It can be used to clock the system but the tolerance of frequency range
must be met.
Preliminary
OUT
). The output may
March 22, 2006
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