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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
  • LM3S6G65-IQC80-A2T PDF在线浏览
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%
Register 17: Program Status Register (PSR)
Note: This register is also referred to as xPSR.
The Program Status Register (PSR) has three functions, and the register bits are assigned to the
different functions:
Application Program Status Register (APSR), bits 31:27,
Execution Program Status Register (EPSR), bits 26:24, 15:10
Interrupt Program Status Register (IPSR), bits 6:0
The PSR, IPSR, and EPSR registers can only be accessed in privileged mode; the APSR register
can be accessed in either privileged or unprivileged mode.
APSR contains the current state of the condition flags from previous instruction executions.
EPSR contains the Thumb state bit and the execution state bits for the If-Then (IT) instruction or
the Interruptible-Continuable Instruction (ICI) field for an interrupted load multiple or store multiple
instruction. Attempts to read the EPSR directly through application software using the MSR instruction
always return zero. Attempts to write the EPSR using the MSR instruction in application software
are always ignored. Fault handlers can examine the EPSR value in the stacked PSR to determine
the operation that faulted (see “Exception Entry and Return” on page 87).
IPSR contains the exception type number of the current Interrupt Service Routine (ISR).
These registers can be accessed individually or as a combination of any two or all three registers,
using the register name as an argument to the MSR or MRS instructions. For example, all of the
registers can be read using PSR with the MRS instruction, or APSR only can be written to using
APSR with the MSR instruction. page 65 shows the possible register combinations for the PSR. See
the MRS and MSR instruction descriptions in the Cortex™-M3/M4 Instruction Set Technical User's
Manual for more information about how to access the program status registers.
Table 2-3. PSR Register Combinations
CombinationTypeRegister
APSR, EPSR, and IPSRR/W
a
,
b
PSR
EPSR and IPSRROIEPSR
APSR and IPSRR/W
a
IAPSR
APSR and EPSRR/W
b
EAPSR
a. The processor ignores writes to the IPSR bits.
b. Reads of the EPSR bits return zero, and the processor ignores writes to these bits.
Program Status Register (PSR)
Type R/W, reset 0x0100.0000
16171819202122232425262728293031
reservedTHUMBICI / ITQVCZN
ROROROROROROROROROROROR/WR/WR/WR/WR/WType
0000000010000000Reset
0123456789101112131415
ISRNUMreservedICI / IT
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
65July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.
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