SC9RS08KA2 datasheet(105/134 Pages) FREESCALE

105 / 134 page

Chapter 12 Development Support

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

105

12.5

RS08 BDC Commands

BDC commands are sent serially from a host computer to the BKGD pin of the target 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 12-2 shows all RS08 BDC commands, a shorthand description of their coding structure, and the

meaning of each command.

Coding Structure Nomenclature

The following nomenclature is used in Table 12-2 to describe the coding structure of the BDC commands.

Commands begin with an 8-bit command code in the host-to-target direction

(most significant bit first)

Separates parts of the command

Delay 16 to 511 target BDC clock cycles

soft-reset

Delay of at least 512 BDC clock cycles from last host falling-edge

AAAA

16-bit address in the host-to-target direction1

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

Eight 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

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

Eight 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

WBKP

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

8765

4321

A13

A12

A11

A10

Any

Reset

0000

000

0000

= Unimplemented or Reserved

Figure 12-7. BDC Breakpoint Match Register (BDCBKPT)

1. The RS08 CPU uses only 14 bits of address and occupies the lower 14 bits of the 16-bit AAAA address field. The values of

address bits 15 and 14 in AAAA are truncated and thus do not matter.

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