Freescale Semiconductor MCF51QE128RM BDM Command Set Descriptions, Freescale Semiconductor 387

Models: MCF51QE128RM

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Chapter 18 Version 1 ColdFire Debug (CF1_DEBUG)

BDC CLOCK (TARGET MCU)

HOST DRIVE

TO BKGD PIN

TARGET MCU

DRIVE AND

SPEED-UP PULSE

PERCEIVED START

OF BIT TIME

BKGD PIN

HIGH-IMPEDANCE

SPEEDUP

PULSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 CYCLES

 

 

 

 

 

 

 

 

EARLIEST START

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 CYCLES

 

 

 

 

 

 

 

 

 

 

 

OF NEXT BIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HOST SAMPLES BKGD PIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 18-17. BDM Target-to-Host Serial Bit Timing (Logic 0)

18.4.1.4BDM Command Set Descriptions

This section presents detailed descriptions of the BDM commands.

The V1 BDM command set is based on transmission of one or more 8-bit data packets per operation. Each operation begins with a host-to-target transmission of an 8-bit command code packet. The command code definition broadly maps the operations into four formats as shown in Figure 18-18.

MCF51QE128 MCU Series Reference Manual, Rev. 3

Freescale Semiconductor

387

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Freescale Semiconductor MCF51QE128RM manual BDM Command Set Descriptions, Freescale Semiconductor 387