mc9s08jm16 Freescale Semiconductor, Inc, mc9s08jm16 Datasheet - Page 334

• Manufacturer Part Number: mc9s08jm16
• Description: S08jm 8-bit Usb Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Development Support
18.2.3
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.
Table 18-1
meaning of each command.
Coding Structure Nomenclature
This nomenclature is used in
334
AAAA
WBKP
WD16
RBKP
RD16
WD
RD
CC
SS
d
/
shows all HCS08 BDC commands, a shorthand description of their coding structure, and 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
delay 16 target BDC clock cycles
8 bits of read data in the target-to-host direction
16 bits of read data in the target-to-host direction
16 bits of write data in the host-to-target direction
the contents of BDCSCR in the target-to-host direction (STATUS)
8 bits of write data for BDCSCR in the host-to-target direction (CONTROL)
16 bits of read data in the target-to-host direction (from BDCBKPT breakpoint
register)
16 bits of write data in the host-to-target direction (for BDCBKPT breakpoint register)
a 16-bit address in the host-to-target direction
8 bits of write data in the host-to-target direction
Table 18-1
MC9S08JM16 Series Data Sheet, Rev. 2
to describe the coding structure of the BDC commands.
Freescale Semiconductor