參數(shù)資料
型號: EFM32-TG-STK3300
廠商: Energy Micro
文件頁數(shù): 85/136頁
文件大小: 0K
描述: KIT STARTER EFM32 GECKO
特色產(chǎn)品: EFM32 Tiny Gecko
標(biāo)準(zhǔn)包裝: 1
系列: EFM®32
類型: MCU
適用于相關(guān)產(chǎn)品: EFM32-TGXXX
所含物品: 板,線纜,CD 和文檔
其它名稱: 914-1018
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
52
www.energymicro.com
if the instruction is conditional, it must be the last instruction in the IT block.
3.4.5.4 Condition flags
These instructions do not change the flags.
3.4.5.5 Examples
LDR
R0, LookUpTable
; Load R0 with a word of data from an address
; labelled as LookUpTable
LDRSB
R7, localdata
; Load a byte value from an address labelled
; as localdata, sign extend it to a word
; value, and put it in R7
3.4.6 LDM and STM
Load and Store Multiple registers.
3.4.6.1 Syntax
op{addr_mode}{cond} Rn{!}, reglist
where:
op
is one of:
LDM
Load Multiple registers.
STM
Store Multiple registers.
addr_mode
is any one of the following:
IA
Increment address After each access. This is the default.
DB
Decrement address Before each access.
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rn
is the register on which the memory addresses are based.
!
is an optional writeback suffix. If ! is present the final address, that is loaded from or
stored to, is written back into Rn.
reglist
is a list of one or more registers to be loaded or stored, enclosed in braces. It can contain
register ranges. It must be comma separated if it contains more than one register or
register range, see Section 3.4.6.5 (p. 53) .
LDM
and LDMFD are synonyms for LDMIA. LDMFD refers to its use for popping data from Full Descending
stacks.
LDMEA
is a synonym for LDMDB, and refers to its use for popping data from Empty Ascending stacks.
STM
and STMEA are synonyms for STMIA. STMEA refers to its use for pushing data onto Empty Ascending
stacks.
STMFD
is s synonym for STMDB, and refers to its use for pushing data onto Full Descending stacks
3.4.6.2 Operation
LDM
instructions load the registers in reglist with word values from memory addresses based on Rn.
STM
instructions store the word values in the registers in reglist to memory addresses based on Rn.
For LDM, LDMIA, LDMFD, STM, STMIA, and STMEA the memory addresses used for the accesses are
at 4-byte intervals ranging from Rn to Rn + 4 * (n-1), where n is the number of registers in reglist.
The accesses happens in order of increasing register numbers, with the lowest numbered register using
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