SC9RS08KA2 datasheet(98/134 Pages) FREESCALE

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Chapter 12 Development Support

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

•

BDC_RESET command allows host to reset MCU without using a reset pin

•

One hardware address breakpoint built into BDC

•

RS08 clock source runs in stop mode if BDM enabled to allow debugging when CPU is in stop

mode

•

COP watchdog suspended while in active background mode

12.3

RS08 Background Debug Controller (BDC)

All MCUs in the RS08 Family contain a single-wire background debug interface which supports in-circuit

programming of on-chip non-volatile memory and sophisticated debug capabilities. Unlike debug

interfaces on earlier 8-bit MCUs, this debug system provides for minimal interference with normal

application resources. It does not use any user memory or locations in the memory map. It requires use of

only the output-only BKGD pin. This pin will be shared with simple user output-only functions (typically

port, comparator outputs, etc.), which can be easily debugged in normal user mode.

RS08 BDM commands are divided into two groups:

•

Active background mode commands require that the target MCU is in active background mode (the

user program is not running). The BACKGROUND command causes the target MCU to enter

active background mode. Active background mode commands allow the CPU registers to be read

or written and allow the user to trace one (TRACE1) user instruction at a time or GO to the user

program from active background mode.

•

Non-intrusive commands can be executed at any time even while the user program is running.

Non-intrusive commands allow a user to read or write MCU memory locations or access status and

control registers within the background debug controller (BDC).

Typically, a relatively simple interface pod is used to translate commands from a host computer into

commands for the custom serial interface to the single-wire background debug system. Depending on the

development tool vendor, this interface pod may use a standard RS-232 serial port, a parallel printer port,

or some other type of communication such as Ethernet or a universal serial bus (USB) to communicate

between the host PC and the pod.

Figure 12-2 shows the standard header for connection of a RS08 BDM pod. A pod is a small interface

device that connects a host computer such as a personal computer to a target RS08 system. BKGD and

GND are the minimum connections required to communicate with a target MCU. The pseudo-open-drain

RESET signal is included in the connector to allow a direct hardware method for the host to force or

monitor (if RESET is available as output) a target system reset.

The RS08 BDM pods supply the VPP voltage to the RS08 MCU when in-circuit programming is required.

The VPP connection from the pod is shared with RESET as shown in Figure 12-2. For VPP requirements

see the FLASH specifications in the electricals appendix.

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