Freescale Semiconductor DEMO9S08DZ60 Demo Board DEMO9S08DZ60 DEMO9S08DZ60 Hoja De Datos

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Freescale Semiconductor

BDC commands are sent serially from a host computer to the BKGD pin of the target HCS08 MCU. All
commands and data are sent MSB-first using a custom BDC communications protocol. Active background
mode commands require that the target MCU is currently in the active background mode while
non-intrusive commands may be issued at any time whether the target MCU is in active background mode
or running a user application program.

 shows all HCS08 BDC commands, a shorthand description of their coding structure, and the

meaning of each command.

This nomenclature is used in

 to describe the coding structure of the BDC commands.

Commands begin with an 8-bit hexadecimal command code in the host-to-target
direction (most significant bit first)

/

 =

separates parts of the command

d

=

delay 16 target BDC clock cycles

AAAA

=

a 16-bit address in the host-to-target direction

RD

=

8 bits of read data in the target-to-host direction

WD

=

8 bits of write data in the host-to-target direction

RD16

=

16 bits of read data in the target-to-host direction

WD16

=

16 bits of write data in the host-to-target direction

SS

=

the contents of BDCSCR in the target-to-host direction (STATUS)

CC

=

8 bits of write data for BDCSCR in the host-to-target direction (CONTROL)

RBKP

=

16 bits of read data in the target-to-host direction (from BDCBKPT breakpoint
register)

WBKP

=

16 bits of write data in the host-to-target direction (for BDCBKPT breakpoint register)