mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 359

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC912DG128 — Rev 3.0
MOTOROLA
(TARGET MCU)
TRANSMIT 1
TRANSMIT 0
OF BIT TIME
PERCEIVED
DRIVE TO
BKGD PIN
SPEEDUP PULSE
BKGD PIN
B CLOCK
(TARGET
B CLOCK
TARGET MCU
HOST
START
HOST
MCU)
HOST
START OF BIT
PERCEIVED
SYNCHRONIZATION
UNCERTAINTY
TIME
Figure 18-2. BDM Target to Host Serial Bit Timing (Logic 1)
Figure 18-1. BDM Host to Target Serial Bit Timing
HIGH-IMPEDANCE
BKGD pin during host-to-target transmissions to speed up rising edges.
Since the target does not drive the BKGD pin during this period, there is
no need to treat the line as an open-drain signal during host-to-target
transmissions.
Freescale Semiconductor, Inc.
For More Information On This Product,
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Development Support
TARGET SENSES BIT
HIGH-IMPEDANCE
HOST SAMPLES
BKGD PIN
HIGH-IMPEDANCE
Background Debug Mode
Development Support
EARLIEST
START OF
Technical Data
EARLIEST
START OF
NEXT BIT
NEXT BIT
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