Command Strobe/CSMA-CA Processor
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Opcode: 0xC8 | M (M = 0–7)
7 6 5 4 3 2 1 0
1 1 0 0 1 M
23.14.9.8 RANDXY
Function: Load random value into X.
Description: The [Y] LSBs of the X register are loaded with a random value. Note that if a second
RANDXY instruction is issued immediately (within 13 clock cycles) after the first, the
same random value is used in both cases. If Y equals zero or is greater than 7, then an
8-bit random value is loaded into X.
Operation: X[(Y – 1):0]: = RNG_DOUT[(Y – 1):0], X[7:Y]: = 0
Opcode: 0xBD
7 6 5 4 3 2 1 0
1 0 1 1 1 1 0 1
23.14.9.9 INT
Function: Interrupt
Description: The interrupt IRQ_CSP_INT is asserted when this instruction is executed.
Operation: IRQ_CSP_INT = 1
Opcode: 0xBA
7 6 5 4 3 2 1 0
1 0 1 1 1 0 1 0
23.14.9.10 WAITX
Function: Wait for X MAC Timer overflows
Description: Wait for MAC Timer to overflow [X] times, where [X] is the value of register X. Each time
a MAC Timer overflow is detected, the value in register X is decremented. Program
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. Note: The difference compared to WAIT W is that
W is a fixed value, whereas X is a register value (which could potentially be changed,
such that the number of overflows actually does not correspond to the value of X at the
time WAITX instruction is run).
Operation: X = X – 1 when MAC Timer overflow = true
PC = PC while X > 0
PC = PC + 1 when X = 0
Opcode: 0xBC
7 6 5 4 3 2 1 0
1 0 1 1 1 1 0 0
23.14.9.11 SETCMP1
256
CC253x Radio SWRU191C–April 2009–Revised January 2012
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