Datasheet

The Delay/side-set field is present in all instructions. Its exact use is configured for each state machine by
PINCTRL_SIDESET_COUNT:
•
Up to 5 MSBs encode a side-set operation (section Section 3.5.1), which optionally asserts a constant value onto
some GPIOs, concurrently with main instruction execution logic
•
Remaining LSBs (up to 5) encode the number of idle cycles inserted between this instruction and the next
3.4.2. JMP
3.4.2.1. Encoding
Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
JMP
0 0 0 Delay/side-set Condition Address
3.4.2.2. Operation
Set program counter to Address if Condition is true, otherwise no operation.
Delay cycles on a JMP always take effect, whether Condition is true or false, and they take place after Condition is evaluated
and the program counter is updated.
•
Condition:
◦
000: (no condition): Always
◦
001: !X: scratch X zero
◦
010: X--: scratch X non-zero, post-decrement
◦
011: !Y: scratch Y zero
◦
100: Y--: scratch Y non-zero, post-decrement
◦
101: X!=Y: scratch X not equal scratch Y
◦
110: PIN: branch on input pin
◦
111: !OSRE: output shift register not empty
•
Address: Instruction address to jump to. In the instruction encoding this is an absolute address within the PIO
instruction memory.
JMP PIN branches on the GPIO selected by EXECCTRL_JMP_PIN. 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 Section 3.5.4).
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
RP2040 Datasheet
3.4. Instruction Set 323