mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 527

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Version 1 ColdFire Debug (CF1_DEBUG)
BDC CLOCK
(TARGET MCU)
HOST DRIVE
HIGH-IMPEDANCE
TO BKGD PIN
SPEEDUP
TARGET MCU
PULSE
DRIVE AND
SPEED-UP PULSE
PERCEIVED START
OF BIT TIME
BKGD PIN
10 CYCLES
EARLIEST START
OF NEXT BIT
10 CYCLES
HOST SAMPLES BKGD PIN
Figure 22-19. BDM Target-to-Host Serial Bit Timing (Logic 0)
22.4.1.4
BDM 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
22-20.
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
22-35