mc68hc912d60c Freescale Semiconductor, Inc, mc68hc912d60c Datasheet - Page 381

• Manufacturer Part Number: mc68hc912d60c
• Description: Hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
(TARGET MCU)
TRANSMIT 1
TRANSMIT 0
OF BIT TIME
PERCEIVED
DRIVE TO
BKGD PIN
SPEEDUP PULSE
BKGD PIN
(TARGET
BDMCLK
TARGET MCU
BDMCLK
HOST
START
HOST
MCU)
HOST
START OF BIT
PERCEIVED
SYNCHRONIZATION
UNCERTAINTY
TIME
Figure 19-2. BDM Target to Host Serial Bit Timing (Logic 1)
Figure 19-1. 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.
10 CYCLES
R-C RISE
10 CYCLES
10 CYCLES
Development Support
TARGET SENSES BIT
HIGH-IMPEDANCE
HOST SAMPLES
BKGD PIN
HIGH-IMPEDANCE
Background Debug Mode
Development Support
Technical Data
EARLIEST
START OF
START OF
EARLIEST
NEXT BIT
NEXT BIT
381