CC2430-RTR1-F64 datasheet(63/234 Pages) TI

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CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 63 of 232

12.9.2 Debug Communication

The debug interface uses an SPI-like two-wire

interface consisting of the Debug Data (P2_1)

and Debug Clock (P2_2) pins. Data is driven

on the bi-directional Debug Data pin at the

positive edge of Debug Clock and data is

sampled on the negative edge of this clock.

Debug commands are sent by an external host

and consist of 1 to 4 output bytes (including

command byte) from the host and an optional

input byte read by the host. Figure 16 shows a

timing diagram of data on the debug interface.

The first byte of the debug command is a

command byte and is encoded as follows:

•

bits 7 to 3 : instruction code

•

bits 2

: return input byte to host byte

when high

•

bits 1 to 0 : number of output bytes from

host following instruction code

byte

P2_2

P2_1

command

first data byte

second data byte

host input byte

Figure 16: Debug interface timing diagram

12.9.3 Debug Commands

The debug commands are shown in Table 33.

Some of the debug commands are described

in further detail in the following sections.

12.9.4 Debug Lock Bit

For software code security the Debug Interface

may be locked. When the Debug Lock bit ,

DBGLOCK, is set (see section 13.14.3) all debug

commands

except

CHIP_ERASE,

READ_STATUS

and

GET_CHIP_ID

are

disabled and will not function. The status of

the Debug Lock bit can read using the

READ_STATUS

command

(see

section

12.9.6). Note that when the Debug Lock bit

has been set, and before reset of the device,

the

Debug

Lock

value

returned

READ_STATUS will only represent the actual

Debug Lock value once either a HALT,

RESUME, DEBUG_INSTR or STEP command

has been attempted executed.

The CHIP_ERASE command is used to clear

the Debug Lock bit.

12.9.5 Debug Configuration

The

commands

WR_CONFIG

and

RD_CONFIG are used to access the debug

configuration data byte. The format and

description of this configuration data is shown

in Table 34.

12.9.6 Debug Status

A Debug status byte is read using the

READ_STATUS command. The format and

description of this debug status is shown in

Table 35.

The READ_STATUS command is used e.g. for

polling the status of flash chip erase after a

CHIP_ERASE command or oscillator stable

status required for debug commands HALT,

RESUME, DEBUG_INSTR, STEP_REPLACE

and STEP_INSTR.

CC2430-RTR1-F64 数据表(PDF) 63 Page - Texas Instruments

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