MC68HC812A4 Datasheet, PDF (310/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

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E-CLOCK
TARGET MCU
HOST DRIVE
TO BKGD PIN
HIGH-IMPEDANCE
TARGET MCU
SPEED-UP PULSE
PERCEIVED START
OF BIT TIME
BKGD PIN
HIGH-IMPEDANCE
R-C RISE
HIGH-IMPEDANCE
10 CYCLES
10 CYCLES
EARLIEST START
OF NEXT BIT
HOST SAMPLES BKGD PIN
Figure 17-2. BDM Target-to-Host Serial Bit Timing (Logic 1)
E-CLOCK
TARGET MCU
HOST DRIVE
TO BKGD PIN
TARGET MCU
DRIVE AND
SPEED-UP PULSE
PERCEIVED START
OF BIT TIME
HIGH-IMPEDANCE
SPEED-UP
PULSE
BKGD PIN
10 CYCLES
10 CYCLES
EARLIEST START
OF NEXT BIT
HOST SAMPLES BKGD PIN
Figure 17-3. BDM Target-to-Host Serial Bit Timing (Logic 0)
MC68HC812A4 — Rev. 3.0
310
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MOTOROLA