Техническая Спецификация для Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK
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Модели
ATSAM4E-EK
169
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
12.6.9.1 BFC and BFI
Bit Field Clear and Bit Field Insert.
Syntax
BFC{cond} Rd, #lsb, #width
BFI{cond} Rd, Rn, #lsb, #width
where:
cond
is an optional condition code, see
.
Rd
is the destination register.
Rn
is the source register.
lsb
is the position of the least significant bit of the bitfield. lsb must be in the range
0 to 31.
0 to 31.
width
is the width of the bitfield and must be in the range 1 to 32-lsb.
Operation
BFC clears a bitfield in a register. It clears width bits in Rd, starting at the low bit position lsb. Other bits in Rd are
unchanged.
unchanged.
BFI copies a bitfield into one register from another register. It replaces width bits in Rd starting at the low bit
position lsb, with width bits from Rn starting at bit[0]. Other bits in Rd are unchanged.
position lsb, with width bits from Rn starting at bit[0]. Other bits in Rd are unchanged.
Restrictions
Do not use SP and do not use PC.
Condition Flags
These instructions do not affect the flags.
Examples
BFC
R4, #8, #12
; Clear bit 8 to bit 19 (12 bits) of R4 to 0
BFI
R9, R2, #8, #12
; Replace bit 8 to bit 19 (12 bits) of R9 with
; bit 0 to bit 11 from R2.