Datasheet

JMP PIN branches on the GPIO selected by EXECCTRL_JMP_PIN, a configuration field which selects one out of the maximum
of 32 GPIO inputs visible to a state machine, independently of the state machine’s other input mapping. The branch is
taken if the GPIO is high.
!OSRE compares the bits shifted out since the last PULL with the shift count threshold configured by SHIFTCTRL_PULL_THRESH.
This is the same threshold used by autopull (Section 3.5.4).
JMP X-- and JMP Y-- always decrement scratch register X or Y, respectively. The decrement is not conditional on the
current value of the scratch register. The branch is conditioned on the initial value of the register, i.e. before the
decrement took place: if the register is initially nonzero, the branch is taken.
3.4.2.3. Assembler Syntax
jmp ( <cond> ) <target>
where:
<cond>
Is an optional condition listed above (e.g. !x for scratch X zero). If a condition code is not specified,
the branch is always taken
<target> Is a program label or value (see Section 3.3.2) representing instruction offset within the program (the
first instruction being offset 0). Note that because the PIO JMP instruction uses absolute addresses
in the PIO instruction memory, JMPs need to be adjusted based on the program load offset at
runtime. This is handled for you when loading a program with the SDK, but care should be taken when
encoding JMP instructions for use by OUT EXEC
3.4.3. WAIT
3.4.3.1. Encoding
Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
WAIT
0 0 1 Delay/side-set Pol Source Index
3.4.3.2. Operation
Stall until some condition is met.
Like all stalling instructions (Section 3.2.4), delay cycles begin after the instruction completes. That is, if any delay
cycles are present, they do not begin counting until after the wait condition is met.
•
Polarity:
◦
1: wait for a 1.
◦
0: wait for a 0.
•
Source: what to wait on. Values are:
◦
00: GPIO: System GPIO input selected by Index. This is an absolute GPIO index, and is not affected by the state
machine’s input IO mapping.
◦
01: PIN: Input pin selected by Index. This state machine’s input IO mapping is applied first, and then Index
selects which of the mapped bits to wait on. In other words, the pin is selected by adding Index to the
PINCTRL_IN_BASE configuration, modulo 32.
◦
10: IRQ: PIO IRQ flag selected by Index
RP2040 Datasheet
3.4. Instruction Set 342