You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27 lines
850 B
27 lines
850 B
Register move instructions
|
|
==========================
|
|
|
|
Document conventions
|
|
--------------------
|
|
|
|
Notation: ``Rd, Rn`` denote ARM registers R0-R15. ``immN`` denotes an immediate
|
|
value having a width of N bits. These instructions affect the condition flags.
|
|
|
|
Register moves
|
|
--------------
|
|
|
|
Where immediate values are used, these are zero-extended to 32 bits. Thus
|
|
``mov(R0, 0xff)`` will set R0 to 255.
|
|
|
|
* mov(Rd, imm8) ``Rd = imm8``
|
|
* mov(Rd, Rn) ``Rd = Rn``
|
|
* movw(Rd, imm16) ``Rd = imm16``
|
|
* movt(Rd, imm16) ``Rd = (Rd & 0xffff) | (imm16 << 16)``
|
|
|
|
movt writes an immediate value to the top halfword of the destination register.
|
|
It does not affect the contents of the bottom halfword.
|
|
|
|
* movwt(Rd, imm32) ``Rd = imm32``
|
|
|
|
movwt is a pseudo-instruction: the MicroPython assembler emits a ``movw`` followed
|
|
by a ``movt`` to move a 32-bit value into Rd.
|
|
|