AN2104 데이터 시트보기 (PDF) - Freescale Semiconductor

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AN2104

Using Background Debug Mode for the M68HC12 Family

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Application Note

Background Debug Mode Application Examples

• When in normal operating mode, another normal operating mode

can be accessed, but this can be done only once.

• To change to the normal operating mode, when the part is in

special operating mode, a 1 (one) must be written twice to the

SMODN bit in the mode register.

• When the part comes up in special single-chip mode, the BDM is

enabled and active.

• When the part comes up in special single-chip mode, it accesses

the BDM ROM, not the normal memory mapped locations at

$FF00–$FFFF.

• To perform hardware commands, the BDM does not need to be

active (see Table 1).

• To perform firmware commands, the BDM must be enabled and

active (see Table 2).

• The BDM does not operate in stop mode.

Background Debug Mode Application Examples

Two BDM application examples are given here in a step-by-step format.

In-Circuit

Programming

of Internal FLASH

This application example of the BDM explains how to perform in-circuit

programming of the internal FLASH memory of an MC68HC912B32

using P&E Microcomputer Systems’ Cable12 POD and software (see

Figure 1). The target board for this example is the M68EVB912B32

evaluation board.

AN2104

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