Espressif ESP32-S2 Programming Manual page 1498

Chapter 4. API Guides
NOP
JUMPR
JUMPS –Jump to a relative address (condition based on stage count)
Syntax JUMPS Step, Threshold, Condition
Operands
• Step –relative shift from current position, in bytes
• Threshold –threshold value for branch condition
• Condition:
– EQ (equal) –jump if value in stage_cnt == threshold
– LT (less than) –jump if value in stage_cnt < threshold
– LE (less or equal) - jump if value in stage_cnt <= threshold
– GT (greater than) –jump if value in stage_cnt > threshold
– GE (greater or equal) —jump if value in stage_cnt >= threshold
Cycles 2 cycles to execute, 2 cycles to fetch next instruction:
// JUMPS target, threshold, EQ
JUMPS next, threshold, LT
JUMPS target, threshold, LE
next:
// JUMPS target, threshold, GT
JUMPS next, threshold, LE
JUMPS target, threshold, GE
next:
Therefore the execution time will depend on the branches taken: either 2 cycles to execute + 2 cycles to fetch,
or 4 cycles to execute + 4 cycles to fetch.
Description The instruction makes a jump to a relative address if condition is true. Condition is the result of
comparison of count register value and threshold value.
Examples:
1:pos: JUMPS
== 20
→
2: // Up counting loop using stage count register
STAGE_RST
label: STAGE_INC
NOP
JUMPS
STAGE_RST –Reset stage count register
Syntax STAGE_RST
Operands No operands
Description The instruction sets the stage count register to 0
Cycles 2 cycles to execute, 4 cycles to fetch next instruction
Examples:
1: STAGE_RST
Espressif Systems
// do something
label, 1, GE // jump to label
is implemented as:
is implemented as:
16, 20, EQ // Jump to (position
//
1 // stage_cnt++
//
label, 16, LT //
// Reset stage count register
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if R0 >=
+ 16
set stage_cnt to 0
do something
jump to label if stage_cnt
1487
(continued from previous page)
1
bytes) if stage_cnt␣
< 16
Release v4.4