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Command Strobe/CSMA-CA Processor
Table 23-4. Instruction Set Summary
Mnemonic 7 6 5 4 3 2 1 0 Description
SKIP <C>, <S> 0 S2 S1 S0 N C2 C1 C0 Skip S instructions on condition C. When condition (C XOR N) is true,
skip the next S instructions, else execute the next instruction. If S = 0,
re-execute the conditional jump (i.e., busy loop until condition is
false). Skipping past the last instruction in the command buffer results
in an implicit STOP command. The conditions are:
C = 0 CCA true
C = 1 Synchronization word received and still receiving packet or
synchronization word transmitted and still transmitting packet
(SFD found, not yet frame end)
C = 2 MCU control bit is 1.
C = 3 Reserved
C = 4 Register X = 0
C = 5 Register Y = 0
C = 6 Register Z = 0
C = 7
RSSI_VALID = 1
WAIT <W> 1 0 0 W4 W3 W2 W1 W0 Wait for MAC Timer to overflow W times. Waits until the MAC Timer
has overflowed W times (W = 0 waits 32 times), then continues
execution. Generates an IRQ_CSP_WAIT interrupt request when
execution continues.
RPT <C> 1 0 1 0 N C2 C1 C0 Repeat loop while condition C. If condition C is true, go to the
instruction following the last LABEL instruction (address in loop-start
register); if the condition is false or no LABEL instruction has been
executed, go to the next instruction.
Note condition C is as defined for SKIP, defined previously in this
table. It is not possible to have a RPT instruction placed at index 23 of
the command buffer.
WEVENT1 1 0 1 1 1 0 0 0 Wait for mact_event1 to go high, and then continue execution.
WEVENT2 1 0 1 1 1 0 0 1 Wait for mact_event2 to go high, and then continue execution.
INT 1 0 1 1 1 0 1 0 Generate an IRQ_CSP_MANINT. Issues an IRQ_CSP_MANINT
interrupt request.
LABEL 1 0 1 1 1 0 1 1 Set the next instruction as the start of a repeat loop. Enters the
address of the next instruction into the loop-start register.
WAITX 1 0 1 1 1 1 0 0 Wait for MAC Timer to overflow [X] times, where [X] is the value of
register X. Each time a MAC Timer overflow is detected, X is
decremented. Execution continues as soon as X = 0. (If X = 0 when
instruction is run, no wait is performed and execution continues
directly). An IRQ_CSP_WAIT interrupt request is generated when
execution continues.
RANDXY 1 0 1 1 1 1 0 1 Load the [Y] LSBs of register X with random value.
SETCMP1 1 0 1 1 1 1 1 0 Set the output csp_mact_setcmp1 high. This sets the compare value
of the MAC Timer to the current timer value.
INCX 1 1 0 0 0 0 0 0 Increment register X.
INCY 1 1 0 0 0 0 0 1 Increment register Y.
INCZ 1 1 0 0 0 0 1 0 Increment register Z.
DECX 1 1 0 0 0 0 1 1 Decrement register X.
DECY 1 1 0 0 0 1 0 0 Decrement register Y.
DECZ 1 1 0 0 0 1 0 1 Decrement register Z.
INCMAXY <M> 1 1 0 0 1 M2 M1 M0 Register Y ≤ min(Y + 1, M). Increment Y, but not beyond M.
Sxxx 1 1 0 1 S3 S2 S1 S0 Execute command strobe S. Send command strobe S to FFCTRL. Up
to 32 command strobes are supported. In addition to the regular
command strobes, two additional command strobes that only apply to
the command strobe processor are supported:
SNOP: Do nothing.
SSTOP: Stops the command strobe processor execution and
invalidates any set label. An IRQ_CSP_STOP interrupt request is
issued.
253
SWRU191C–April 2009–Revised January 2012 CC253x Radio
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