Datasheet

PINS and PINDIRS use the OUT pin mapping, as described in section Section 3.5.6.
If automatic pull is enabled, the OSR is automatically refilled from the TX FIFO if the pull threshold, SHIFTCTRL_PULL_THRESH,
is reached. The output shift count is simultaneously cleared to 0. In this case, the OUT will stall if the TX FIFO is empty, but
otherwise still executes in one cycle. The specifics are given in section Section 3.5.4.
OUT EXEC allows instructions to be included inline in the FIFO datastream. The OUT itself executes on one cycle, and the
instruction from the OSR is executed on the next cycle. There are no restrictions on the types of instructions which can be
executed by this mechanism. Delay cycles on the initial OUT are ignored, but the executee may insert delay cycles as
normal.
OUT PC behaves as an unconditional jump to an address shifted out from the OSR.
3.4.5.3. Assembler Syntax
out <destination>, <bit_count>
where:
<destination> Is one of the destinations specified above.
<bit_count> Is a value (see Section 3.3.3) specifying the number of bits to shift (valid range 1-32)
3.4.6. PUSH
3.4.6.1. Encoding
Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PUSH
1 0 0 Delay/side-set 0 IfF Blk 0 0 0 0 0
3.4.6.2. Operation
Push the contents of the ISR into the RX FIFO, as a single 32-bit word. Clear ISR to all-zeroes.
•
IfFull: If 1, do nothing unless the total input shift count has reached its threshold, SHIFTCTRL_PUSH_THRESH (the same as
for autopush; see section Section 3.5.4).
•
Block: If 1, stall execution if RX FIFO is full.
PUSH IFFULL helps to make programs more compact, like autopush. It is useful in cases where the IN would stall at an
inappropriate time if autopush were enabled, e.g. if the state machine is asserting some external control signal at this
point.
3.4.6.3. Assembler Syntax
push ( iffull )
push ( iffull ) block
push ( iffull ) noblock
where:
iffull
Is equivalent to IfFull == 1 above. i.e. the default if this is not specified is IfFull == 0
block
Is equivalent to Block == 1 above. This is the default if neither block nor noblock are specified
RP2040 Datasheet
3.4. Instruction Set 327