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LM3S6G65-IQC80-A2T

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型号: LM3S6G65-IQC80-A2T
PDF文件:
  • LM3S6G65-IQC80-A2T PDF文件
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功能描述: Stellaris® LM3S6G65 Microcontroller
PDF文件大小: 6152.12 Kbytes
PDF页数: 共1044页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S6G65-IQC80-A2T
PDF页面索引
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120%
For example, if all of the memory access behavior is intended to take effect immediately after the
programming sequence, then a DSB instruction and an ISB instruction should be used. A DSB is
required after changing MPU settings, such as at the end of context switch. An ISB is required if
the code that programs the MPU region or regions is entered using a branch or call. If the
programming sequence is entered using a return from exception, or by taking an exception, then
an ISB is not required.
Updating an MPU Region Using Multi-Word Writes
The MPU can be programmed directly using multi-word writes, depending how the information is
divided. Consider the following reprogramming:
; R1 = region number
; R2 = address
; R3 = size, attributes in one
LDR R0, =MPUNUMBER ; 0xE000ED98, MPU region number register
STR R1, [R0, #0x0] ; Region Number
STR R2, [R0, #0x4] ; Region Base Address
STR R3, [R0, #0x8] ; Region Attribute, Size and Enable
An STM instruction can be used to optimize this:
; R1 = region number
; R2 = address
; R3 = size, attributes in one
LDR R0, =MPUNUMBER ; 0xE000ED98, MPU region number register
STM R0, {R1-R3} ; Region number, address, attribute, size and enable
This operation can be done in two words for pre-packed information, meaning that the MPU Region
Base Address (MPUBASE) register (see page 158) contains the required region number and has
the VALID bit set. This method can be used when the data is statically packed, for example in a
boot loader:
; R1 = address and region number in one
; R2 = size and attributes in one
LDR R0, =MPUBASE ; 0xE000ED9C, MPU Region Base register
STR R1, [R0, #0x0] ; Region base address and region number combined
; with VALID (bit 4) set
STR R2, [R0, #0x4] ; Region Attribute, Size and Enable
Subregions
Regions of 256 bytes or more are divided into eight equal-sized subregions. Set the corresponding
bit in the SRD field of the MPU Region Attribute and Size (MPUATTR) register (see page 160) to
disable a subregion. The least-significant bit of the SRD field controls the first subregion, and the
most-significant bit controls the last subregion. Disabling a subregion means another region
overlapping the disabled range matches instead. If no other enabled region overlaps the disabled
subregion, the MPU issues a fault.
Regions of 32, 64, and 128 bytes do not support subregions. With regions of these sizes, the SRD
field must be configured to 0x00, otherwise the MPU behavior is unpredictable.
July 24, 2012102
Texas Instruments-Production Data
Cortex-M3 Peripherals
OBSOLETE: TI has discontinued production of this device.
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