CC2430-RTR1-F64Z datasheet(190/234 Pages) TI

190 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 190 of 232

Immediate Command Strobes are written

Immediate

Command

Strobe

instruction to the CSP which are issued

instantly to the Radio module. The

Immediate Command Strobe instruction is

also used only to control the CSP. The

Immediate Command Strobe instructions

are described in section 1.1.1.

Program execution mode means that the

CSP executes a sequence of instructions,

from a program memory or instruction

memory, thus constituting a short user-

defined

program.

The

available

instructions are from a set of 14

instructions. The instruction set is defined

in section 1.1.1. The required program is

first loaded into the CSP by the CPU, then

the CPU instructs the CSP to start

executing the program.

The program execution mode together

with the MAC Timer allows the CSP to

automate CSMA-CA algorithms and thus

act as a co-processor for the CPU.

The operation of the CSP is described in

detail in the following sections. The

command strobes and other instructions

supported by the CSP are given in section

14.34.8 on page 194. Example programs

for the CSP are shown in section 14.34.9

on page 201.

RFST (0xE1) – RF CSMA-CA / Strobe Processor

Bit

Name

Reset

R/W

Description

7:0

INSTR[7:0] 0xC0

R/W

Data written to this register will be written to the CSP

instruction memory. Reading this register will return the

CSP instruction currently being executed.

14.34.1 Instruction Memory

The CSP executes single byte program

instructions which are read from a 24 byte

instruction

memory.

The

instruction

memory is written to sequentially through

the SFR register RFST. An instruction write

pointer is maintained within the CSP to

hold the location within the instruction

memory where the next instruction written

to RFST will be stored. Following a reset

the write pointer is reset to location 0.

During each RFST register write, the write

pointer will be incremented by 1 until the

end of memory is reached when the write

pointer will stop incrementing. The first

instruction written to RFST will be stored in

location 0, the location where program

execution starts. Thus a complete 24

instruction program is written to the

instruction

memory

writing

each

instruction in the desired order to the RFST

The write pointer may be reset to 0 by

writing the immediate command strobe

instruction ISSTOP. In addition the write

pointer will be reset to 0 when the

command strobe SSTOP is executed in a

program.

Following a reset, the instruction memory

is filled with SNOP (No Operation)

instructions (opcode value 0xC0).

While the CSP is executing a program,

there shall be no attempts to write

instructions to the instruction memory by

writing to RFST. Failure to observe this

rule can lead to incorrect program

execution and corrupt instruction memory

contents. However, Immediate Command

Strobe instructions may be written to RFST

(see section 14.34.3).

14.34.2 Data Registers

The CSP has three data registers CSPT,

CSPX, CSPY and CSPZ, which are

read/write accessible for the CPU as RF

registers. These registers are read or

modified by some instructions, thus

allowing the CPU to set parameters to be

used by a CSP program or allowing the

CPU to read CSP program status.

The CSPT data register is not modified by

any instruction. The CSPT data register is

used to set a MAC Timer overflow

compare value. Once program execution

has started on the CSP, the contents of

this register is decremented by 1 each

time the MAC timer overflows. When CSPT

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