Chapter 4. API Guides
(continued from previous page)
NOP // do something
JUMPR label, 1, GE // jump to label if R0 >= 1
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 is implemented as:
JUMPS next, threshold, LT
JUMPS target, threshold, LE
next:
// JUMPS target, threshold, GT is implemented as:
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 16, 20, EQ // Jump to (position + 16 bytes) if stage_cnt␣
,→== 20
2: // Up counting loop using stage count register
STAGE_RST // set stage_cnt to 0
label: STAGE_INC 1 // stage_cnt++
NOP // do something
JUMPS label, 16, LT // jump to label if stage_cnt < 16
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 // Reset stage count register
Espressif Systems 1487
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