Chapter 4. API Guides
Description The instruction makes jump to the specified address. Jump can be either unconditional or based on an
ALU flag.
Examples:
1: JUMP R1 // Jump to address in R1 (address in R1 is in␣
,→32-bit words)
2: JUMP 0x120, EQ // Jump to address 0x120 (in bytes) if ALU␣
,→result is zero
3: JUMP label // Jump to label
...
label: nop // Definition of label
4: .global label // Declaration of global label
MOVE R1, label // R1 = label (value loaded into R1 is in words)
JUMP R1 // Jump to label
...
label: nop // Definition of label
JUMPR –Jump to a relative offset (condition based on R0)
Syntax JUMPR 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 R0 == threshold
– LT (less than) –jump if value in R0 < threshold
– LE (less or equal) –jump if value in R0 <= threshold
– GT (greater than) –jump if value in R0 > threshold
– GE (greater or equal) –jump if value in R0 >= threshold
Cycles Conditions EQ, GT and LT: 2 cycles to execute, 2 cycles to fetch next instruction
Conditions LE and GE are implemented in the assembler using two JUMPR instructions:
// JUMPR target, threshold, LE is implemented as:
JUMPR target, threshold, EQ
JUMPR target, threshold, LT
// JUMPR target, threshold, GE is implemented as:
JUMPR target, threshold, EQ
JUMPR target, threshold, GT
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 R0 register value and the threshold value.
Examples:
1:pos: JUMPR 16, 20, GE // Jump to address (position + 16 bytes) if␣
,→value in R0 >= 20
2: // Down counting loop using R0 register
MOVE R0, 16 // load 16 into R0
label: SUB R0, R0, 1 // R0--
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Espressif Systems 1486
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