CC2430-RTR1-F64 datasheet(191/234 Pages) TI

191 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 191 of 232

reaches zero, program execution is halted

and the interrupt IRQ_CSP_STOP is

asserted. The CSPT register will not be

decremented if the CPU writes 0xFF to

this register.

Note: If the CSPT register compare

function is not used, this register must be

set to 0xFF before the program execution

is started.

14.34.3 Program Execution

After the instruction memory has been

filled, program execution is started by

writing the immediate command strobe

instruction ISSTART to the RFST register.

The program execution will continue until

either the instruction at last location has

been executed, the CSPT data register

contents is zero, a SSTOP instruction has

been executed, an immediate ISSTOP

instruction is written to RFST or until a

SKIP instruction returns a location beyond

the last location in the instruction memory.

Immediate Command Strobe instructions

may be written to RFST while a program is

being

executed.

this

case

the

Immediate instruction will bypass the

instruction in the instruction memory,

which

will

completed

once

the

Immediate

instruction

has

been

completed.

During program execution, reading RFST

will return the current instruction being

executed. An exception to this is the

execution of immediate command strobes,

during which RFST will return C0h.

14.34.4 Interrupt Requests

The CSP has three interrupts flags which

can produce the RF interrupt vector.

These are the following:

•

IRQ_CSP_STOP: asserted when

the processor has executed the

last instruction in memory and

when the processor stops due to a

SSTOP or ISSTOP instruction or

CSPT register equal zero.

•

IRQ_CSP_WT: asserted when the

processor continues executing the

next instruction after a WAIT W or

WAITX instruction.

•

IRQ_CSP_INT: asserted when the

processor

executes

INT

instruction.

14.34.5 Random Number Instruction

There will be a delay in the update of the

random number used by the RANDXY

instruction. Therefore if an instruction,

RANDXY, that uses this value is issued

immediately after a previous RANDXY

instruction, the random value read may be

the same in both cases.

14.34.6 Running CSP Programs

The basic flow for loading and running a

program on the CSP is shown in Figure

56.

When program execution stops due to end

of program the current program remains in

program memory so that the same

program can be run again by starting

execution once again with the ISSTART

command.

However,

when

program

execution is stopped by the SSTOP or

ISTOP instruction, the program memory

will be cleared.

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